How hard is to code?

I would suggest you start building bots, starting with simple login bots.
Take up a project and learn a language as it progresses.
Python imho is the best language beginners should start with.
It's easy to learn and the possibilities one could explore are endless.

HTML/CSS are 'languages' so please stop suggesting them.

If you wanna start making apps I suggest Ionic framework. You can learn building apps, while learning javascript, html,css.