I started doodling in class at the start of tertiary education and I eventually learned how to draw there out of sheer boredom.
Like any other skill, it takes practice to master. While you can brute-force drawing from scratch, reading up on some techniques and anatomy will help a lot.
Started doodling the same way, been on and off at it for some years and I must say prolongued, boredom-driven brute force works better than expected
I've had some troubles with reading up on tech&Co. as that always seems to get my expectations higher than what I can achieve, which ends up being somewhat discouraging even if I'm visibly improving at the thing, which is far less of a problem with doodle art as I'm mostly having some stupid fun
Like any other skill, it takes practice to master. While you can brute-force drawing from scratch, reading up on some techniques and anatomy will help a lot.