>>1243986>>1243986Practice your line control, gesture and abstracts volumes like spheres, cones and especially boxes in different angles so if you want to do stuff with perspective you have a base to start.
Because of your cartoon style, I could recommend you Sinix videos but the guy rambles a lot sometimes.
I found this book some time ago, since probably neither of us can read japanese, just copy the images and try experimenting yourself, do cartoons of people from photos and all that type of stuff. Good luck and have fun, anon!
https://e-hentai.org/g/2176347/32c50f8ce3/ 