How do you save in a variable what the user inserts in an <input> tag?

Question

What I want to know is how I do so that after the user inserts certain text in the input, it is saved in a variable
(Sorry for the bad english)

Answer 1

https://code.sololearn.com/WX308fgKv7vw/?ref=app

look at js part.

Answer 2

Using DOM.

https://www.sololearn.com/learn/JavaScript/2761/

Answer 3

Thanks