diff --git a/content/about/_index.md b/content/about/_index.md
new file mode 100644
index 0000000..b83734d
--- /dev/null
+++ b/content/about/_index.md
@@ -0,0 +1,9 @@
+---
+title: About me
+menu:
+  main:
+    params:
+      prefix: fad
+      icon: fa-circle-info
+    weight: -1
+---
diff --git a/content/about/crypto/_index.md b/content/about/crypto/_index.md
new file mode 100644
index 0000000..13136d3
--- /dev/null
+++ b/content/about/crypto/_index.md
@@ -0,0 +1,10 @@
+---
+title: Cryptocurrencies
+menu:
+  main:
+    parent: About me
+    params:
+      prefix: fad
+      icon: fa-bitcoin-sign
+    weight: -1000
+---
diff --git a/content/about/crypto/ubq/index.md b/content/about/crypto/ubq/index.md
new file mode 100644
index 0000000..0be6bf2
--- /dev/null
+++ b/content/about/crypto/ubq/index.md
@@ -0,0 +1,3 @@
+---
+title: UBIQ
+---
diff --git a/content/about/identities/_index.md b/content/about/identities/_index.md
new file mode 100644
index 0000000..c4348aa
--- /dev/null
+++ b/content/about/identities/_index.md
@@ -0,0 +1,10 @@
+---
+title: Online accounts
+
+menu:
+  main:
+    parent: About me
+    params:
+      prefix: fad
+      icon: fa-id-card
+---
diff --git a/content/about/identities/github.md b/content/about/identities/github.md
new file mode 100644
index 0000000..7dac9df
--- /dev/null
+++ b/content/about/identities/github.md
@@ -0,0 +1,6 @@
+---
+title: GitHub
+date: 2017-02-01
+link: https://github.com/MillironX
+fa-thumbnail: fab fa-github
+---
diff --git a/content/about/identities/orcid.md b/content/about/identities/orcid.md
new file mode 100644
index 0000000..c0959d2
--- /dev/null
+++ b/content/about/identities/orcid.md
@@ -0,0 +1,6 @@
+---
+title: ORCiD
+date: 2020-02-26
+link: https://orcid.org/0000-0003-1219-9320
+fa-thumbnail: fab fa-orcid
+---
diff --git a/content/about/identities/stack-overflow.md b/content/about/identities/stack-overflow.md
new file mode 100644
index 0000000..75edee5
--- /dev/null
+++ b/content/about/identities/stack-overflow.md
@@ -0,0 +1,6 @@
+---
+title: StackExchange
+date: 2014-08-08
+link: https://stackexchange.com/users/4863541/milliron-x
+fa-thumbnail: fab fa-stack-overflow
+---
diff --git a/content/about/pgp/index.md b/content/about/pgp/index.md
new file mode 100644
index 0000000..8f5950f
--- /dev/null
+++ b/content/about/pgp/index.md
@@ -0,0 +1,151 @@
+---
+title: PGP Key
+
+menu:
+  main:
+    parent: About me
+    params:
+      prefix: fad
+      icon: fa-key-skeleton
+    weight: -1000
+---
+
+```plaintext
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=Mb3J
+-----END PGP PUBLIC KEY BLOCK-----
+```
diff --git a/layouts/partials/menu.html b/layouts/partials/menu.html
new file mode 100644
index 0000000..4069f2a
--- /dev/null
+++ b/layouts/partials/menu.html
@@ -0,0 +1,42 @@
+{{ $currentPage := . }}
+{{ range .Site.Menus.main }}
+  {{ $url := .URL | absURL }}
+  {{ $active := or (eq $currentPage.Permalink (absURL .URL)) ($currentPage.IsMenuCurrent "main" .) }}
+  {{ if .HasChildren }}
+    <li class="nav-item dropdown">
+      <a
+        class="nav-link pl-0 dropdown-toggle {{ if $active }}active{{ end }}"
+        href="{{ $url }}"
+        data-bs-toggle="dropdown"
+        role="button"
+        aria-haspopup="true"
+        aria-expanded="false"
+      >
+        <i class="{{ .Params.prefix }} {{ .Params.icon }} fa-fw"></i>
+        {{ .Name }}
+      </a>
+      <div class="dropdown-menu">
+        {{ range .Children }}
+          {{ $childurl := .URL | absURL }}
+          <a
+            class="dropdown-item {{ if $active }}active{{ end }}"
+            href="{{ $childurl }}"
+          >
+            <i class="{{ .Params.prefix }} {{ .Params.icon }} fa-fw"></i>
+            {{ .Name }}
+          </a>
+        {{ end }}
+      </div>
+    </li>
+  {{ else }}
+    <li class="nav-item">
+      <a
+        class="nav-link pl-0 {{ if $active }}active{{ end }}"
+        href="{{ $url }}"
+      >
+        <i class="{{ .Params.prefix }} {{ .Params.icon }} fa-fw"></i>
+        {{ .Name }}
+      </a>
+    </li>
+  {{ end }}
+{{ end }}
diff --git a/layouts/partials/sidebar.html b/layouts/partials/sidebar.html
index ae469d4..3c12880 100644
--- a/layouts/partials/sidebar.html
+++ b/layouts/partials/sidebar.html
@@ -28,19 +28,7 @@
       </a>
       <div class="collapse navbar-collapse sidebar">
         <ul class="flex-column navbar-nav w-100 justify-content-between">
-          {{ range .Site.Menus.main }}
-            <li class="nav-item">
-              <a
-                class="nav-link pl-0 {{ if $currentPage.IsMenuCurrent "main" . }}
-                  active
-                {{ end }}"
-                href="{{ .URL }}"
-              >
-                <i class="{{ .Params.prefix }} {{ .Params.icon }} fa-fw"></i>
-                {{ .Name }}
-              </a>
-            </li>
-          {{ end }}
+          {{ partial "menu.html" . }}
         </ul>
       </div>
     </div>