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.