A friend of mine pointed me to this great website where you can interactively practice and learn new programming skills by working through small coding challenges, like making a game.

CodinGame.com is an gamified learning community and website that allows you to learn new concepts by solving fun challenges. Pick from over 25 programming languages, including Python, C, C++, C#, Java, JavaScript, Go, and many more. In a matter of hours, you will work on hot programming topics, discover new languages, algorithms, and tricks in courses crafted by top developers.