Simple steps to upgrade Sitecore 8.2 application to 10 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 Sitecore Validators: Validating image width, height and aspect ratio Using Sitecore Field Validators
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 https://blog.vitaliitylyk.com/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