How many languages? LinkedIn vs me.

Question

I mean: I'm italian, but I speak English, French and Spanish. I'm able to read in German and Greek. I know some Japanese sentences, I read Hangeul (Korean alphabet). Now I'm skilled with Html, Html5, Css and Css3... Why I need JavaScript too?
I'm not so young (I'm 40 y.o.) and not so able with maths or science 😆 or any other scientific subject...

Answer 1

//I think you missed something
JavaScript is one of the most popular programming languages on earth and is used to add interactivity to webpages, process data, as well as create various applications (mobile apps, desktop apps, games, and more)

and Your native speaking language has no connection with coding languages
https://www.sololearn.com/learn/JavaScript/1123/

Answer 2

Sure, I'm at the beginning... but too many variables... And my first really block: double precision floating point numbers.
If you assure me that everything will become clearer, then I will feel more comfortable on going forward XD