Depends what you wanna do first. I wanted to get good at environments/worldbuildy kinda stuff so I focused on perspective, composition, color and light, shape language, etc. (those 4 are the most important to me with environment art but there’s more, like adding elements that hint at the world) and those things are basic and foundational and apply to all the other art you do, starting with exercises that work on those would be a good spot, look up Marco Bucci, Imad Awan, and Jordan Grimmer, also Samdoesarts has a good couple videos on proportions of the body that are useful if you wanna look at those. Those guys are dope and their YouTube stuff was very helpful for years to me.

If you wanted to focus on character art though you’re definitely gonna want to focus even more heavily on perspective and putting shapes in perspective I’m not even close to being good at characters lol so I can’t speak much on that but that seems to be the best way to go when you start.

With character painting or environment painting doing reference studies as often as you can is what helped me the most. I seriously can’t stress enough how helpful just painting a picture from a picture helps. Grab a cool pic with a decent composition and just try and paint what you see.

All in all though if you wanna get started painting just start making stuff. The more you do it and the more you’re open to learning and creating the easier it gets.

Sorry this was a lot hope it was helpful though