I find Excel to be a bit quirky...
You could try to ask a teacher from the math or science department at your school what programs they'd recommend. They should be able to teach you how to use it as well. I'm not sure how your schools work, but ours have heaps of licenses for all sorts of programs, plus lots of apps developed for the school available for download. One just haves to login to the school servers, and its all there.
My favourite graphing app is one developed especially for Danish schools and is easier to use than excel, plus that i has a lot more functions. Though it's in Danish only.
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