Link to online user guide for iPadOS 15?

The iPad User Guide is available both online using a web browser (such as Safari), or as an Apple Books download:

Online > iPad User Guide - Apple Support

Download > https://books.apple.com/book/id1567104892

Hi there!

I hope this link helps.

Here is everything to know about Ipad. https://support.apple.com/guide/ipad/welcome/ipados

Take note that you can search on Apple's website what is new in iPadOS 15.

Good luck!

You are very welcome.

The Guide in its two different formats, whilst containing essentially the same information, are usefully complimentary. When learning about a particular feature, the Book version is considerably more “readable” - but for quick lookup, the online guide is very often the quickest route to needed information.