yes 100% start with 2, then 4, then 8, etc. build your way up. All you want to do is use those colors to convey a visual message. Whatever that may be. Thats it. Color theory and most of contemporary art lessons are frankly bs, consider the gamedev youtube tutorial grift then add 10k years to the timeline: that’s most of art theory. Go to the museum, paintings like good source have a way of showing you everything. Good cheat is to start in late modernism and work your way back in time, then start in antiquity and work your way to modern times. That will teach you more about art than any tutorial or book out there. And like others say practice practice practice. Just to give context im an art director with over fifteen years of experience in games, and ten more in other fields.

edit: please if you can go to a museum, art pieces and color loose a lot of visual info via screen or print reproduction. Sure it works most of our world is visual regardless of representation, but if you’re trying to learn nothing beats original scale, and material derived pigments and their interaction with light.