diff --git a/code/_data/repos.json b/code/_data/repos.json
index 19832d2..d342165 100644
--- a/code/_data/repos.json
+++ b/code/_data/repos.json
@@ -244,7 +244,7 @@
     ],
     "repo": "buildbroken-blog-archive",
     "repo_url": "https://github.com/skoelle/buildbroken-blog-archive",
-    "summary": "Static archive of \"build broken\", a defunct .NET/software-craftsmanship blog (aztec-project.org). Rebuilt with Hugo from Wayback Machine snapshots, all content, images, and comments hosted locally as a self-contained static site."
+    "summary": "Static archive of \"build broken\", a defunct .NET/software-craftsmanship blog. Rebuilt with Hugo from Wayback Machine snapshots, all content, images, and comments hosted locally as a self-contained static site."
   },
   {
     "title": "moonweb-site",
diff --git a/retro/amiga-hardware-landscape/index.njk b/retro/amiga-hardware-landscape/index.njk
index 9d0e423..0f8af27 100644
--- a/retro/amiga-hardware-landscape/index.njk
+++ b/retro/amiga-hardware-landscape/index.njk
@@ -3,8 +3,8 @@ title: "Running AmigaOS in 2026: MiSTer FPGA vs Amiberry on Pi"
 section: "retro"
 description: "Two very different ways to get a fully working AmigaOS 3.2.3 desktop running today."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>Running AmigaOS in 2026: MiSTer FPGA vs Amiberry on Pi</h1>
 <div class="detail-content">
 
diff --git a/retro/amiga-modern-platforms/index.njk b/retro/amiga-modern-platforms/index.njk
index e412e51..0fa568f 100644
--- a/retro/amiga-modern-platforms/index.njk
+++ b/retro/amiga-modern-platforms/index.njk
@@ -3,8 +3,8 @@ title: "Vampire V4, A600GS or MiSTer: Amiga Hardware Isn't a Simple Speed Race"
 section: "retro"
 description: "Why raw benchmark numbers are actively misleading when comparing modern Amiga hardware options."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>Vampire V4, A600GS or MiSTer: Amiga Hardware Isn't a Simple Speed Race</h1>
 <div class="detail-content">
 
diff --git a/retro/atari-mega-st-fleet/index.njk b/retro/atari-mega-st-fleet/index.njk
index 5ffbc14..acb3c81 100644
--- a/retro/atari-mega-st-fleet/index.njk
+++ b/retro/atari-mega-st-fleet/index.njk
@@ -3,8 +3,8 @@ title: "The Atari Mega ST Fleet: Three Machines, Three Jobs"
 section: "retro"
 description: "How three Atari Mega ST computers ended up with completely different roles in a modern retro setup."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>The Atari Mega ST Fleet: Three Machines, Three Jobs</h1>
 <div class="detail-content">
 
diff --git a/retro/atari-monitor-compatibility/index.njk b/retro/atari-monitor-compatibility/index.njk
index 009dcb3..21911b0 100644
--- a/retro/atari-monitor-compatibility/index.njk
+++ b/retro/atari-monitor-compatibility/index.njk
@@ -3,8 +3,8 @@ title: "The 15kHz Problem: Finding a Monitor That Speaks Atari"
 section: "retro"
 description: "Why most modern monitors refuse to display Atari ST colour modes, and which ones actually work."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>The 15kHz Problem: Finding a Monitor That Speaks Atari</h1>
 <div class="detail-content">
 
diff --git a/retro/atari-networking-bbs/index.njk b/retro/atari-networking-bbs/index.njk
index e67bf04..fd68d3f 100644
--- a/retro/atari-networking-bbs/index.njk
+++ b/retro/atari-networking-bbs/index.njk
@@ -3,8 +3,8 @@ title: "Getting a 40-Year-Old Computer Online: Atari ST Networking and BBS Acces
 section: "retro"
 description: "Connecting an Atari ST to the modern internet and to dial-up-era bulletin board systems, warts and all."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>Getting a 40-Year-Old Computer Online: Atari ST Networking and BBS Access</h1>
 <div class="detail-content">
 
diff --git a/retro/batocera-living-room/index.njk b/retro/batocera-living-room/index.njk
index e49384c..b8ca972 100644
--- a/retro/batocera-living-room/index.njk
+++ b/retro/batocera-living-room/index.njk
@@ -3,8 +3,8 @@ title: "Batocera in the Living Room: One Box, Every Retro System"
 section: "retro"
 description: "Why the living room emulation station takes a completely different approach than the FPGA rigs upstairs."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>Batocera in the Living Room: One Box, Every Retro System</h1>
 <div class="detail-content">
 
diff --git a/retro/dos-486-tower/index.njk b/retro/dos-486-tower/index.njk
index 2b4f7dd..93009bb 100644
--- a/retro/dos-486-tower/index.njk
+++ b/retro/dos-486-tower/index.njk
@@ -3,8 +3,8 @@ title: "The 486 DX2-66 Tower: An Original PC Living Alongside Its FPGA Twin"
 section: "retro"
 description: "Keeping an original Colani-design 486 tower running while a MiSTer core covers the same era digitally."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>The 486 DX2-66 Tower: An Original PC Living Alongside Its FPGA Twin</h1>
 <div class="detail-content">
 
diff --git a/retro/et4000-experiment/index.njk b/retro/et4000-experiment/index.njk
index 92e03c7..3ec5ce3 100644
--- a/retro/et4000-experiment/index.njk
+++ b/retro/et4000-experiment/index.njk
@@ -3,8 +3,8 @@ title: "Why an ET4000 Graphics Card and a Mega ST Don't Mix (Yet)"
 section: "retro"
 description: "A cautionary tale about pushing 1980s power supplies past their limits with a modern-ish graphics card."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>Why an ET4000 Graphics Card and a Mega ST Don't Mix (Yet)</h1>
 <div class="detail-content">
 
diff --git a/retro/mini-arcade-handheld-roundup/index.njk b/retro/mini-arcade-handheld-roundup/index.njk
index be84a85..ab3d8ce 100644
--- a/retro/mini-arcade-handheld-roundup/index.njk
+++ b/retro/mini-arcade-handheld-roundup/index.njk
@@ -3,8 +3,8 @@ title: "Mini Arcades and Handhelds: Sorting the Real Deal from the Bootlegs"
 section: "retro"
 description: "A buyer's guide to compact retro gaming devices, and why the cheapest option is almost never the right one."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>Mini Arcades and Handhelds: Sorting the Real Deal from the Bootlegs</h1>
 <div class="detail-content">
 
diff --git a/retro/mist-mister-fpga/index.njk b/retro/mist-mister-fpga/index.njk
index 0c013cc..ba5b5c3 100644
--- a/retro/mist-mister-fpga/index.njk
+++ b/retro/mist-mister-fpga/index.njk
@@ -3,8 +3,8 @@ title: "MiST and MiSTer: Two FPGA Boxes, Two Very Different Personalities"
 section: "retro"
 description: "Why the newer, more powerful MiSTer isn't automatically the better choice for every retro system."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>MiST and MiSTer: Two FPGA Boxes, Two Very Different Personalities</h1>
 <div class="detail-content">
 
diff --git a/retro/pimiga-journey/index.njk b/retro/pimiga-journey/index.njk
index 6bd15bb..38000a7 100644
--- a/retro/pimiga-journey/index.njk
+++ b/retro/pimiga-journey/index.njk
@@ -3,8 +3,8 @@ title: "PiMiga 3 to 5: Chasing the Perfect Amiga-on-a-Pi Distro"
 section: "retro"
 description: "Three generations of PiMiga later, here's what actually changed — and why newer isn't always better."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>PiMiga 3 to 5: Chasing the Perfect Amiga-on-a-Pi Distro</h1>
 <div class="detail-content">
 
diff --git a/retro/retro-corner-snapshot/index.njk b/retro/retro-corner-snapshot/index.njk
index d4bd18b..fb919ee 100644
--- a/retro/retro-corner-snapshot/index.njk
+++ b/retro/retro-corner-snapshot/index.njk
@@ -3,8 +3,8 @@ title: "The Retro Corner Today: A Snapshot of the Whole Setup"
 section: "retro"
 description: "A tour through every retro system currently active across the home, room by room."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>The Retro Corner Today: A Snapshot of the Whole Setup</h1>
 <div class="detail-content">
 
diff --git a/retro/the-a1200/index.njk b/retro/the-a1200/index.njk
index 1a7677a..d0df7ca 100644
--- a/retro/the-a1200/index.njk
+++ b/retro/the-a1200/index.njk
@@ -3,8 +3,8 @@ title: "The A1200: What We Know Before It Ships"
 section: "retro"
 description: "A close look at Retro Games Ltd.'s upcoming Amiga 1200 console, based on everything public so far."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to retro overview</a>
 <h1>The A1200: What We Know Before It Ships</h1>
 <div class="detail-content">
 
diff --git a/shared/_includes/base.njk b/shared/_includes/base.njk
index 998f3cb..f0ca7fd 100644
--- a/shared/_includes/base.njk
+++ b/shared/_includes/base.njk
@@ -5,11 +5,13 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>{{ title }} · moonweb.org</title>
   <meta name="description" content="{{ description }}">
+  <meta name="author" content="Stefan Koelle">
+  <meta name="theme-color" content="{% if section == 'hub' %}#3b6ea5{% elif section == 'infra' %}#99333A{% elif section == 'smarthome' %}#1f8a8a{% elif section == 'code' %}#3E5098{% elif section == 'retro' %}#8a6d3b{% else %}#3b6ea5{% endif %}">
   <link rel="canonical" href="{{ site.url }}{{ page.url }}">
   <meta property="og:title" content="{{ title }} · moonweb.org">
   <meta property="og:description" content="{{ description }}">
   <meta property="og:url" content="{{ site.url }}{{ page.url }}">
-  <meta property="og:type" content="website">
+  <meta property="og:type" content="{% if parent %}article{% else %}website{% endif %}">
   <meta name="twitter:card" content="summary">
   <meta name="twitter:title" content="{{ title }} · moonweb.org">
   <meta name="twitter:description" content="{{ description }}">
@@ -19,6 +21,22 @@
   <link href="https://fonts.googleapis.com/css2?family=Lobster&display=swap" rel="stylesheet">
   <link rel="stylesheet" href="/shared-base.css">
   <link rel="stylesheet" href="/theme.css">
+  <script type="application/ld+json">
+  {
+    "@context": "https://schema.org",
+    "@type": "{% if parent %}BreadcrumbList{% else %}WebSite{% endif %}",
+    {% if parent %}
+    "itemListElement": [
+      { "@type": "ListItem", "position": 1, "name": "{{ section }}", "item": "{{ site.url }}/" },
+      { "@type": "ListItem", "position": 2, "name": "{{ title }}", "item": "{{ site.url }}{{ page.url }}" }
+    ]
+    {% else %}
+    "name": "{{ title }} · moonweb.org",
+    "url": "{{ site.url }}",
+    "author": { "@type": "Person", "name": "Stefan Koelle" }
+    {% endif %}
+  }
+  </script>
 </head>
 <body>
   <header class="site-header">
diff --git a/shared/_includes/sitemap.njk b/shared/_includes/sitemap.njk
index a081e09..470507f 100644
--- a/shared/_includes/sitemap.njk
+++ b/shared/_includes/sitemap.njk
@@ -5,6 +5,8 @@
   <url>
     <loc>{{ site.url }}{{ page.url }}</loc>
     <lastmod>{{ page.date | date }}</lastmod>
+    <changefreq>{% if page.url == "/" %}weekly{% else %}monthly{% endif %}</changefreq>
+    <priority>{% if page.url == "/" %}1.0{% elif parent %}0.8{% else %}0.7{% endif %}</priority>
   </url>
   {%- endif %}
 {%- endfor %}
diff --git a/smarthome/home-dashboard-controls/index.njk b/smarthome/home-dashboard-controls/index.njk
index ff1ccce..3ca3207 100644
--- a/smarthome/home-dashboard-controls/index.njk
+++ b/smarthome/home-dashboard-controls/index.njk
@@ -3,8 +3,8 @@ title: "Home Control Buttons"
 section: "smarthome"
 description: "Overview of the central buttons dashboard used to control lighting, smart plugs, music, network devices and monitoring shortcuts around the apartment."
 layout: base.njk
+parent: "/"
 ---
-<a class="back-link" href="/">← Back to infra overview</a>
 <h1>Home Control Buttons</h1>
 <div class="detail-content">
 
diff --git a/stefankoelle/_includes/stefankoelle.njk b/stefankoelle/_includes/stefankoelle.njk
index 516824c..9c606fa 100644
--- a/stefankoelle/_includes/stefankoelle.njk
+++ b/stefankoelle/_includes/stefankoelle.njk
@@ -25,6 +25,30 @@
   <meta name="msapplication-TileColor" content="#ffffff">
   <meta name="msapplication-TileImage" href="/assets/ms-icon-144x144.png">
   <link rel="canonical" href="{{ site.url }}{{ page.url }}">
+  <meta name="author" content="Stefan Koelle">
+  <meta property="og:title" content="{{ title }}">
+  <meta property="og:description" content="{{ description }}">
+  <meta property="og:url" content="{{ site.url }}{{ page.url }}">
+  <meta property="og:type" content="website">
+  <meta property="og:image" content="{{ site.url }}/assets/stefan-koelle-foto.jpg">
+  <meta name="twitter:card" content="summary">
+  <meta name="twitter:title" content="{{ title }}">
+  <meta name="twitter:description" content="{{ description }}">
+  <meta name="twitter:image" content="{{ site.url }}/assets/stefan-koelle-foto.jpg">
+  <script type="application/ld+json">
+  {
+    "@context": "https://schema.org",
+    "@type": "Person",
+    "name": "Stefan Koelle",
+    "url": "{{ site.url }}",
+    "jobTitle": "Software Developer",
+    "sameAs": [
+      "https://www.linkedin.com/in/stefankoelle/",
+      "https://github.com/skoelle",
+      "https://www.xing.com/profile/Stefan_Koelle"
+    ]
+  }
+  </script>
   <link rel="stylesheet" href="/assets/style.css?v=3">
 </head>
 <body class="blog">
diff --git a/stefankoelle/assets/manifest.json b/stefankoelle/assets/manifest.json
index 013d4a6..ce81363 100755
--- a/stefankoelle/assets/manifest.json
+++ b/stefankoelle/assets/manifest.json
@@ -1,5 +1,6 @@
 {
- "name": "App",
+ "name": "Stefan Koelle",
+ "short_name": "SK",
  "icons": [
   {
    "src": "\/android-icon-36x36.png",
diff --git a/stefankoelle/ledmatrix/index.njk b/stefankoelle/ledmatrix/index.njk
index e8a2917..523f3cd 100644
--- a/stefankoelle/ledmatrix/index.njk
+++ b/stefankoelle/ledmatrix/index.njk
@@ -3,13 +3,32 @@ title: "LED Matrix WebServer"
 description: "WiFi-controlled LED display solution with REST API, DHT22 sensor, and OTA updates."
 ---
 <!DOCTYPE html>
-<html lang="de">
+<html lang="en">
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta name="description" content="{{ description }}">
-  <meta name="author" content="Stefan Kölle">
+  <meta name="author" content="Stefan Koelle">
   <link rel="canonical" href="{{ site.url }}{{ page.url }}">
+  <meta property="og:title" content="{{ title }}">
+  <meta property="og:description" content="{{ description }}">
+  <meta property="og:url" content="{{ site.url }}{{ page.url }}">
+  <meta property="og:type" content="article">
+  <meta property="og:image" content="{{ site.url }}/assets/ledmatrix.jpg">
+  <meta name="twitter:card" content="summary">
+  <meta name="twitter:title" content="{{ title }}">
+  <meta name="twitter:description" content="{{ description }}">
+  <meta name="twitter:image" content="{{ site.url }}/assets/ledmatrix.jpg">
+  <script type="application/ld+json">
+  {
+    "@context": "https://schema.org",
+    "@type": "Article",
+    "headline": "{{ title }}",
+    "description": "{{ description }}",
+    "author": { "@type": "Person", "name": "Stefan Koelle" },
+    "url": "{{ site.url }}{{ page.url }}"
+  }
+  </script>
   <title>{{ title }} - ESP32 Project</title>
   <link rel="stylesheet" href="assets/style.css?v=3">
 </head>
diff --git a/stefankoelle/pdf/cv.pdf b/stefankoelle/pdf/cv.pdf
index 682c9de..f40888f 100644
Binary files a/stefankoelle/pdf/cv.pdf and b/stefankoelle/pdf/cv.pdf differ
diff --git a/stefankoelle/sitemap.xml.njk b/stefankoelle/sitemap.xml.njk
index a36321b..c7e8c77 100644
--- a/stefankoelle/sitemap.xml.njk
+++ b/stefankoelle/sitemap.xml.njk
@@ -9,6 +9,8 @@ eleventyExcludeFromCollections: true
   <url>
     <loc>{{ site.url }}{{ page.url }}</loc>
     <lastmod>{{ page.date | date }}</lastmod>
+    <changefreq>{% if page.url == "/" %}weekly{% else %}monthly{% endif %}</changefreq>
+    <priority>{% if page.url == "/" %}1.0{% else %}0.8{% endif %}</priority>
   </url>
   {%- endif %}
 {%- endfor %}