Here is a Brackeys overview that's super good and stuff.

https://www.youtube.com/watch?v=d_NA_yTXOOQ

To get started quickly here is a short list of common free tools the peeps at SFA will be familiar with

Game engines:

• https://unity.com/download FOR GENERAL 2D/3D game development
• https://twinery.org/ FOR TEXT BASED ADVENTURES

Art

• https://krita.org/en/ For paining, 2d frame animation and pixel art
• https://www.blender.org/ For 3d modelling and animation

Music and sound

• https://www.audacityteam.org/ Audacity for simple audio editing. Good enough for most.
• https://www.reaper.fm/ Fully fleshed out free Digital audio workstation