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I know an ok amount of c# but I just started Unity and I am wondering if there is a place where I can learn the basic valuable keywords like GetKey
Unity and Unity Docs
Just like a spoken language, the more you use it, the more words you learn. As you get better, your projects will get bigger, and you will write more code. All the time here in the forums, or on StackOverflow, you will see how other people do things, and the key words they use. Eventually, you'll be saying, "I'm sure unity has something for this" and find it in the docs right away.