The Telerik Documentation and the Knowledge Base section of it are using static pages. The entire site is located in our GitHub Repository at https://github.com/telerik/ajax-docs. You can clone it to your computer if you want to have it locally.
Telerik Demos are built in a Visual Studio WebSite project and every page is static. You can download the demos with the Telerik Installer/Control Panel.
At Progress, we provide UI Components and we can offer guidance in utilizing the Telerik Controls, their APIs as well as help with the built-in functionalities of the Components.
Topics related to Web Design & Planning, you can research on the internet or consult with the appropriate community.
For your convenience I have found some articles that might be helpful, see:
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.