Well, you need to know that NO iPad, even an iPad Pro is NO full laptop/desktop computer replacement.
There will be plenty of things you cannot do OR DO easily that any laptop/desktop can very easily do.
While there is a Files app, for accessing actual created files on a particular app, Apple DOES NOT allow ANY user access to ANY of the iOS/iPadOS file structure system, unlike with any full laptop/desktop computer.
Apple even makes it much harder now to access the file system structure in its newest of macOS versions!
With that all stated and out of the way, Apple has a Apple books iPad users guide that you can download and read for reference.
iPad Users Guide for iPadOS 14.7 found here.
Tap the Apple Books link below
https://books.apple.com/us/book/ipad-user-guide/id1515995498
There are plenty of iPad tutorials on Apple’s YouTube channel.
Tap the link below.
https://youtube.com/playlist?list=PLIl2EzNYri0crmY28ZNs-bsgzGOms2nAn
Best of Luck to You!