Storage almost full on my iPad go to settings.

If you need to free up free data storage space on an iPad/iDevice, you need to start by backing up your iPad to either Apple's iCloud or by connecting your iDevice to a computer running the latest iTunes or some other offsite, “cloud” data storage service, like Google Drive/Photos, DropBox, Box, etc.

Then, delete any installed apps that you no longer use or use infrequently enough that they aren't missed ( you can always reinstalled any purchased or free apps at some time later, as you need them ).

Thin out/delete any music/videos/movies/TV shows/images/eBooks/eMagazine/iBooks/audiobooks/Documents/PDFs, etc.

If you use a POP email account on your iPad, delete/thin out any old saved emails that maybe saved to your iPad.

To permanently delete photos/images off of your iDevice go into the Photos app and find the Recently Deleted folder/album and permanently delete any photos/images stored in that folder/album.

Also, you can check to see what stuff is eating up all your valuable data storage space by going into the Settings App, General Settings Panel, in the right hand column, tap Storage & iCloud usage panel ( in iOS 11 and later, it’s iPad Storage ), in the top Storage Panel, tap the Manage Storage panel, wait for a list of apps to generate that will tell you how much space each app is taking up on your iDevice.

Then, do a hard reset of your iPad by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

iDevices need to maintain, at the very least, a minimum of between 2-3 GBs of free data storage space, at all times, to insure normal/nominal functionalities/operation and general overall performance of any iDevice.

Best of Luck to You!

Anything you purchased from iTunes, using your Apple ID will be accessible to you now or in the future, so delete away. But notes, text messages, photos etc., are a completely different thing. If you delete them from your iPad, they will delete from your iCloud account. iCloud is not an archival system. It is a backup system. You may not need text or email messages, but notes you likely don't want to lose. If you decide to delete photos, back them up to your computer or a cloud based storage medium first.