Get Familiar with iPadOS 13.3.1 & Older Updates
We recommend getting familiar with iPadOS 13.3.1 before you install it. That way, you aren't caught off guard by the changes. You can do so via our walkthrough.
You'll want to get acquainted with these updates because, again, their features and fixes are baked into your version of iPadOS 13.3.1 if you skipped them.
If for some reason you're still running iOS 12, take a look at our iPadOS 13 vs. iOS 12 walkthrough. It will take you through the key differences between the two operating systems and get you caught up in no time.
We've also put together a guide that will take you through all of the major changes from the most recent versions of iOS 12 and it's a great place to get started.