In addition to booking a one-to-one Genius Bar session, Apple Stores offer many taster sessions that cover many aspects of devices and Apple Apps. These are available to book as available from Apple's Today at Apple website:
Today at Apple - Apple
For learning at your own pace, consider reviewing the (frequently overlooked) iPad and iPhone User Guide. These are a rich source of information about your iPad/iPhone, iPadOS/iOS and many of the native Apps:
iPad User Guide - Apple Support
iPhone User Guide - Apple Support
The Tips App, installed by default on all new models of iPad, provides a brief introduction to many aspects of iPad and iPhone - and leads you to the respective User Guide. In case you missed it, here is a link to the Tips App:
https://apps.apple.com/gb/app/tips/id1069509450
Apple also has a huge Apple YouTube Channel - containing videos and feature guidance:
https://www.youtube.com/user/Apple
There are also comprehensive guides for iCloud and Apple’s main productivity Apps, such as Numbers (spreadsheets), Pages (documents) and Keynote (presentations):
iCloud User Guide - Apple Support
Numbers User Guide for iPad - Apple Support
Pages User Guide for iPad - Apple Support
Keynote User Guide for iPad - Apple Support
There are more comprehensive Apple User Guides to discover. You can find them simply by using a web-browser and your favourite search engine.