Which language should I choose to start?

[hushed imp]

The proper answer depends on why you want to learn coding.

[dusky kraken]

Now I am only a teenager and I want to learn something, that I could use in the future

I want something easy right now

[dusky kraken]

I have never done any things with software

I have a knowledge in hardware, but in software - only did scratch wich is kinda useless

[hushed imp]

As I mentioned before, HTML is easier than JS, but HTML is not really a programming language. It doesn't have proper conditional logic. It does have conditional comments, but that is an ancient technique used during the "browser wars" to enable certain parts of code depending on which browser was in use. It's not general purpose conditional logic like what exists in proper programming languages.

To learn real programming, the only good options for first language are Javascript and Python. Since we are on a Javascript server, I will recommend that more strongly.

[dusky kraken]

ok, so I have another question

what are libraries doing?

[hushed imp]

A library is a collection of pre-written code. It allows you to not need to write portions of code that are commonly needed.

[dusky kraken]

So it's like you don't have to code everything by yourself?