https://freecourses.github.io/
Freecourses is a platform which offers a collection of free course links for various development languages and frameworks. You will find every course which is listed here is either free or trial version for learning. So enjoy the content.
You can also contribute to the project. Check below different ways for contributions please check in CONTRIBUTING.md
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If you want the skills to turn your game ideas into reality, or get ready to
jump into professional game development, this is the program for you!
The core of this Nanodegree program is libGDX, a powerful cross platform game
development framework that allows you to release your game on a variety of
devices and operating systems.