add information about Plan B network course

content/guide/devs.md

@@ -16,6 +16,10 @@ integrate RGB into your software, check out developer guidelines:
   **Contractum**, with its first version release targeting end of the year.
 
   <a href="/program" class="button button-secondary">Learn to program</a>
+
+  We highly recommend to watch [CSV 402: Introduction to RGB Programming][course] --
+  a great three-day course by RGB creator, Dr Maxim Orlovsky and other protocol
+  contributors, made for [Plan B Network][planb].
 
 * ### Integrating RGB
 
@@ -34,3 +38,6 @@ integrate RGB into your software, check out developer guidelines:
   starting point can be through multiple RGB learning resources.
 
   <a href="/docs" class="button button-secondary">Access docs</a>
+
+[course]: https://planb.network/en/courses/csv402
+[planb]: https://planb.network

content/guide/learn.md

@@ -29,6 +29,14 @@ check the following resources:
 
   <a href="/docs#api" class="button button-secondary">API references</a>
 
+* ### [CSV-402: Introduction to RGB Programming][course]
+
+  For those, who wants to become experts in RGB, a [three-day dive-in course][course] by
+  [Plan B Network][planb] is a must-to-watch series.
+
+
 [FAQ]: https://rgbfaq.com
 [YouTube channel]: https://youtube.com/LNP-BP
 [RGB whitepaper]: https://blackpaper.rgb.tech
+[course]: https://planb.network/en/courses/csv402
+[planb]: https://planb.network