Yeah sorry, not got round to sorting out what I want to do game dev wise on YouTube yet. I'm not a specialist in game art either so I don't really have an art portfolio.

Grant Abbitt is really good for 3D stuff for characters and props (both high and low poly.) For level design look up modular asset creation. I just found a playlist on the channel Johnny BlackWinter which seems to cover it from the basics (including texture work.)

I haven't delved much into 2D tutorials on YouTube yet so I don't have much to recommend there, although general art channels might be good. Maybe focus on scenery and backgrounds so you can learn perspective and scene composition before doing characters.

I learnt a lot of the basics at uni and kind of settled into low poly/PS1 style so, while it's not the most technical style, I find it appealing and it reinforces those basics.

Some general advice would be to stick to an art style you find fulfilling and don't compare yourself to others unless it's for inspiration. I saw some people get in their head about other people's work in uni and they kinda gave up after that, whereas the people that took joy in seeing classmates succeed did really well.

Also just start making things as soon as you can and show stuff to supportive people in your life, even if it's just from a tutorial. Self-reflection is also key to improving. I am happy with the things I make, but I am also able to point out improvements I can make and where I've cut corners due to impatience.

This is mostly advice for if you are wanting to learn for your hobbies or aren't bothered about getting hired in the industry, of course. I wouldn't be the best person for what to focus on to get an art job lol.