when can i say " learning is finish and i know anything to make an APP"
every time i open a door i see another closed door. always there is a closed door

I can pretty confidently say that there is never a definite end, but there is a point where you've learned enough to ship a product. Each app has its own use cases, its own problems, its own limitations, and different languages/databases/frameworks have their own benefits and drawbacks.

When I taught a university web development class, I told my students the first day that if they were there to just get a quick degree for big money and not have to learn anything new, they were getting into the wrong field. A couple students dropped out of my class after that.

Agree totally with @tytho. I have been in tech for many years/decades and the great thing is you will never know it all. Always a lot of exciting things to learn.

If you are in tech 20 years from now you will probably remember this rant and say those guys were right 😀

I'm experiencing this problem right now on a smaller scale. I'm trying to wrap my head around a new framework. and every time I think I've figured out how something works and I can move on coding freely, I walk straight into another locked door for which I have to find the key.

It's frustrating, but damn have my skills and knowledge improved!