There's pretty much more than 100 tutorial in the youtube, but not everyone can go through it completely, it is very boring to watch like 8+ hours of videos.
If you already know some about CE, aob and some programming language, then watch this video to start hacking on DF.
If you barely know anything, then start by completing CE tutorial and learning some C++ (which could take years).
ppl do that everytime for find codes on df ?