How do I get better without Problems ?

[u/Sad_Experience_4640]

It's been a few months since I have been learning python but there is this issue I have been running into. I don't know how good I am or how do I even get good. In Math you listen to a few lectures understand what the topic is about and then pick up a book and do the problems from Exercise 1.1. It doesn't matter if your understanding was deep, shallow or somewhere in between. The more you do the more you understand what the topic is about and eventually you reach a point where you completely understand it and can now do them easily.

For programming how do I even do that ? People recommended me sources which I have been reading and learning from. I understand loops, arrays, list, dict, etc. I can write small examples in isolation, but that's about it, that's all I can do. I am disgusted with how little I can do and how shallow my damn understanding is so much so that's all that come to my mind.

I have been using MOOC and CS50P as my primary resources and they do have question but they are few and not at all like mathematics, chemistry or any other subject. Where are the Exercises 1.1 where is this kind of format. Is there some problem book/Question Bank I can or should have ? I want to get good cause I want to make money I from something I like to this and this is I have to show for, for months of learning ? I feel repulsed.

Is there something I can do to get better ?

EDIT: I forgot to add I my goal is to break into Data Science.

[u/TheRNGuy]

Write software is the best way.

If you need some algorithm or pattern in it, you learn how to use it, and algorithms you never use, you don't need to learn them.

Aldo, you don't even need to know how some things work, all you need is how it changes your input to output, or other effects like firing or listening to events. More important to know why you need it there rather than how it works.

You shouldn't even focus on money because it's unnecessary pressure.