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As far as develop your own code, I have two questions:

1. Does following tutorials (not strictly, customising and changing as needed) count as someone else's code? (Okay, one related question to this too: If so, can we use the built-in FPS controller?)

2. Are we allowed to ask for help on troublesome code problems on sites like Brackey's forums, Stack Exchange, etc.?

Yep! That's all good.