In today's world, everybody is a self-taught developer. So, the main thing for developing skills to pro-level is only by playing games. (Many of you haven't thought about this maybe)
Let's see what are these game.
Dungeon & Developers
Well, this is first in my list because I like RPG games and I know many developers also like to play RPG. (See I'm smart).It is not exactly a game, but it provides really cool graphics and it is worth a look. You can master many things here. This is developed by and web dev agency. A classic one.
Link -> dungeonsanddevelopers.com
CodinGame
They offer many free games where you have to solve puzzles. There are many languages supported here. You can also invite friends to play online. If you want to increase the challenge - you can also participate in international programming competitions.
Link -> codingame.com/training
Untrusted
This website is specifically to increase your Javascript skills by solving problems related to web development.
Link -> alexnisnevich.github.io/untrusted
CodeWars
I think this website has every language or all the major language. You just have signup here by answering some questions and all. Here you earn points by solving different challenges, each one covering different coding principles, and compete with other developers for the highest position on the scoreboard.
Link -> codewars.com
Thanks For Reading. 😁 You can't become PRO by just reading this go and play. 😂
I will be posting less on my blogs coz working on a website(for you all) and writing an eBook.