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Ionic 3
TUTORIALS
Ionic 3 was released on the beginning of 2017 and it was fully linked to Angular framework.
Ionic 5 is currently the latest version of Ionic Framework. It was released on February 2020. The changes of this version compared with Ionic 4 were mainly centered around UI/UX. It's a very solid version that allows to build cross-platform native and web apps.
If you want to start building your first Ionic application using Ionic 5, I strongly recommend checking out this Ionic 5 Template that will save you hundreds of hours of design and development by handling all the boilerplate that normally takes weeks.