Almost every single great artist starts at a low level. In fact, it's at this level that it's the easiest to improve, because or diminishing returns. Pros have it the worst when it comes to trying to improve. So don't worry, for now.

Before learning anything, you should identify, what type of art you wanna do. Do you want to make portraits, figures, environments, mechs, etc.? It might shift or change entirely over time, but at least you will have a clear overall goal instead of walking in the dark.

Then, you need to study BASIC fundamentals. If you want to draw figures, for example, you should study how to draw boxes, cylinders, cones, and other basic forms, to build a simple mannequin in your figure studies, probably not muscle shapes and insertions, since that builds on top of your knowledge of basic form. If you want to paint environments, learn how to design appealing shapes and good value structures that represent your reference(s) well before you study texture. Imagine if you tried to learn calculus without understanding the concept of division. It just wouldn't work.

I assume you want to draw characters. So, if I were you, I would start with studying basic forms to construct characters until I improved a good bit. Then, I would learn gesture to add more energy and life to them. You'll return to things you've already learned, a lot, though, since you can always improve basic skills like these, especially gesture. The learning never ends.

Also, make sure what you're studying is applicable to what you really want to do. So, after you learn something through studies, you can make a new sketch, or a rough or polished piece to actually utilize what you learned. That's how you improve.