Are there any episodes or series on CMS related gems ?
I have to build CMS for one of my clients. I would like to know your suggestions also please let me know if we have any related videos here.
Have you tried a Google search for Rails CMSes? What kind of CMS are you having to build? Would something like Administrate work or do you need a more designerly type of tool?
This is one of my favorites. https://pchm.co/posts/tutorial-how-to-build-a-cms-in-ruby-on-rails
I'd recommend not building your own. Try FaeCMS or Spina - good options for fairly simple CMS requirements.
Consider requirements carefully. Many clients would rather spend less up-front and email me a format readily convertible to markdown or HTML for me to maintain their site in a static site builder deployed to CDN. Fast and cheap.
Your requirements will dictate if you need to build a tool for maintaining specific structured content, static generation of structured content (perhaps with your own rails app), implement a general purpos CMS, etc.