I took another look with https://www.google.com/#q=pinterest+tutorial but at second look I came up empty as to the features you asked for.
https://help.pinterest.com/en/guide/following-and-your-home-feed pretty much covers this is the same old design where you "follow" boards and people. But I get the feeling you want it to be more searching but I found it lacking too.
This is why I did look at such but went back to discussion boards as I don't find much use for Pininterest or Facebook and it's "follow me" design.
For me, one of the very cute services of visual bookmarks has one flaw, for which I find it confusing.
When I click on some interesting Board (no Pin), most of the recommendations in the mail, I'll get on it right at the top and I can choose "Follow board." If I do that, then appears in the list of boards on my personal page. I'm interested primarily first choice right (Boards) screen, which after a certain time are a lot and cluttered, from different areas of interest. My point is in these areas and asked whether on this page these followed boards can sort into some folders. First choice left (Topics), are similar to this option, but in a different way. They showing me mot my Boards, but different. Suggested, but not still of my interest. This arises for me confusion when I reveal unfollowed Boards. Looking for various tutorials that are for anything other than what I need.
I hope I have described it clearly.
thanks for any advice and personal experience