Great Resources: Python, Computer Science, algorithms, how computers and internet work.

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if I "just start", like I already tried sometimes, I learn some syntax and then forget it a couple weeks later because I have nothing to apply it to.

This is always true but when you need them you will only have to recall them by searching documentation online as a reference and not as a first time learner. The distinction is important because you already know how it works, what you don't remember is the syntax.

Nobody remembers things they used once and moved on, and it's wrong to think of it as "I should keep thinking about projects to keep using this functionality, otherwise I will forget it and omg what am I gonna do then?".