New the the Ecosystem

I just recently bought the second generation iPad Pro 10.5 inch with a Smart Keyboard for school and so far I’m loving the multitasking on this thing but I feel like I’m not taking full advantage of everything my iPad and the App Store have to offer, what are some productivity apps that you feel are must haves on such a device for work and school, maybe even time killers. I’m asking this because its my first apple device in a very long time, as I own mainly Samsung products.
Edit: Title should say “New to the Ecosystem”
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