@DimitrisFragkoulis You'll find lots of free courses from online schools such as Udemy. If you want you can check also LinkedIn learning (if you have paid account), Pluralsight, CodeSchool, Shaw Academy and Coursera.
I am new to plnkr.co, and trying to add angular to a play project, but nothing happens when I click on the add button. Am I missing something obvious here? Do I need to login first (that doesn't seem to work either, actually...)