Best way to start System Design?

Hello. I'm interested in learning System Design.

I have some basic knowledge( primitive I can say).

I want to be prepared for SDE2 roles in a year or two.

There are lots of resources available and I'm a bit confused. What is the best way to learn System Design like a pro. (Zero to Hero)

It would be better if I gain practical knowledge rather than just theory.

Thank you very much.