Yeah, there’s a ton of materials you can find online to start. Youtube videos as @fighter5347 mentioned are probably the most comfortable place to start. You can get your questions answered here or on AnswerHub. So make yourself at home! Even today with all materials and tools and courses most will come out of your own will to study and dig the information up.
I’d say start with simple game series, such as these:
Twin-Stick shooter: https://www.youtube.com/watch?v=1pmPb_TWG-8&list=PLZlv_N0_O1gb5sdygbSiEU7hb0eomNLdq
Endless Runner: https://www.youtube.com/watch?v=yS-yQfo0lc0&list=PLZlv_N0_O1gbY4FN8pZuEPVC9PzQThNn1
Simple and easy games to understand. Once you get the hang of it, try reproducing a simple game like Flappy Bird.
Plus, we are here to help =)