I'm a pretty big fan of tutorials. A lot of my earliest drawing study (aside from middle/high school art class) was out of "How to Draw" books. "Manga for Dummies" was actually one of my most prized books in middle school. That thing's THICK and has a lot of solid pointers (obviously mostly for "manga drawing" but the sections on shading, anatomy, clothing/folds/etc. all helped a ton getting a handle on those things). Nowadays there's tons of tutorials for things on youtube and the like.
I think it's important to look at tutorials in a "big picture" kind of way and not just copy them 1-for-1 and apply it to your drawings though. Like if you watch an artist's tutorial on "how to color/shade hair" drink it all in, and try the techniques, but don't be afraid to just keep the parts that you like/work well for you and dismiss the rest.
I fell in the trap around highschool of trying to follow my favorite deviantart artist's copic marker coloring tutorial to a T and pushing out a ton of iffy colored pictures that borderline looked worse than what I had already been doing. Her drawings were a lot more detailed than mine, so trying to apply a super detailed coloring strategy to them just didn't work well xD But! I learned a lot about the mechanics of how to make the markers blend from that and was able to develop my own techniques from that increased understanding. That's how tutorials should be, imo.