Where Ubuntu fits
Use it when a course, application or deployment guide targets Ubuntu.
Check before you choose
Choose the support lifecycle you need and check hardware compatibility before installing.
Find the right edition
Start with the destination for your device or the publisher's website. Use the current requirements and terms there to confirm the edition you need.
Compare the workflow
A desktop distribution, a server system and a specialist toolkit serve different purposes. Decide whether you want a fixed release, rolling updates or a declarative setup before comparing desktop appearances.