Thank you! ^-^
And have fun with making games, it takes a lot of time but it's worth it... even when stuff doesn't work TT_TT
It depends on the program you use but for Godot Brackeys youtube channel is a great place to start, specifically his "how to make a video game" video.
A LOT of youtube tutorials... I use Godot to make games and coding was the thing I knew the least about so Learn to code from zero helped a lot. Brackeys godot videos are also great for beginners.
I made the viewport size 488x256 and I used a ps1 shader. I think it was this one https://godotshaders.com/shader/ps1-psx-model/
I used Godot youtube tutorials and https://gdquest.github.io/learn-gdscript/ to learn coding.