Python

Books. Deep understanding comes from comprehensive explanation and exercise. The former you will only find in books. There are really good and comprehensive articles about certain topics on realpython.com as well.

Tech with tim is a good one

I want to be a professional as well..

Take it step by step. Try @pythonres.

Use books And practice a lot

Do you have any experience with other languages

There is a discrepancy between your interest in deep understanding and the materials you ask for.

Okey now what will i do for that?

read the replies you got, you have links there and plenty of material to start

Maybe he just wants shallow understanding so.deeply (badly)

no, yt might be okay for some tips, but it’s not suitable for learning the language from scratch as a beginner. The official documentation is the only reliable resource that can teach you the language

Youtube might actually be okay to getting started. Certainly not my recommendation (!), but it might work. But for absolute beginners it may indeed be better than the official documentation of Python, where they do have a tutorial, but which is explicitly written for people with prior experience in other languages. And as for "the only reliable resource that can teach you the language" I would say that that's not true. Books are great resources. Maybe not always fully up-to-date, but great resources. The official documentation however is the best reference. That is, what you use when you already know the language, but need to look things up.

I said that YT videos are not the best source just by my experience with them and other admins in other groups. I forgot to say about books, they are really usefull more or less as the docs When i was a beginner i watched some python videos but i learnt a lot more with a my friend that teached me the basics and reading simple projects. I've also received a python book for a my birthday but i never read it at all