You literally enter "Rep'py tutorial" or "Honey Select tutorial" in youtube search and you will find them all. You can add "beginner" in the search terms to narrow it down.
Yeah - lots of youtube tutorials for Renpy out there, although they are a bit of a hit or miss. Some of them are not that useful.
But the documentation that comes along with Renpy can really get you a long way, so I would suggest looking at that before going to Youtube.
Honestly, if you know basic Javascript and HTML/CSS then using that to make a game isn't much harder than using Ren'py, and it gives you a lot more flexibility IMO.