How do you know what layout size and window size to use for a particular game? Also where can I get info to learn coding and what each function does on construct 2.
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I would start with the construct 2 manual as well as work my way through the beginner tutorials. There are some really great resources on this site and you will learn a lot. Also there are some really good tutorials on youtube as well.
https://www.scirra.com/manual
https://www.scirra.com/tutorials