Here's the basics on how to animate in Sketchbook by Autodesk! Sketchbook isn't my main animation programme (that's TVPaint 11 Pro) but it's really simple to use and great for beginners. If Sketchbook isn't for you I also made an animation tutorial for Krita (linked below) and I'll be doing more of these as the year goes on so I hope they help you!
Krita Tutorial - https://youtu.be/k8XImKvRAls
Download Sketchbook - https://www.sketchbook.com
What tools I use to animate - https://www.amazon.co.uk/shop/kdsketch