Simple steps to upgrade Sitecore 8.2 application to 10

https://dev.sitecore.net/Downloads/Sitecore_Experience_Platform/102/Sitecore_Experience_Platform_102.aspx

Sitecore Validators: Validating image width, height and aspect ratio

How to start development with Sitecore Commerce 9 / Sitecore Commerce 9 Learning Resources

https://sitecore.stackexchange.com/questions/12771/how-to-start-development-with-sitecore-commerce-9-sitecore-commerce-9-learning

Guide on refactoring your Sitecore solution to Sitecore JSS

Sitecore 9 Installation on Azure using Sitecore Installation Framework

https://www.youtube.com/watch?v=pYW2spnRL9U