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Well, i think the best way to learn that sort of stuff is just come up with things to do and make them work. If you don't know how, look stuff up online.
Or poke me on discord.

And I'm not 100% positive on it being C family language, but it looks like it so it's at least kinda close.
Though it obviously has Arduino/other thing commands mixed in.
For starters, if there's more LEDs, make them blink in a pattern or something. Like from right to left.