Elementor has a free, large online academy, consisting of tutorials. We encourage you to follow their tutorials when working on basic Elementor updates.
View the Elementor Academy
View the Elementor Video Tutorials
Getting Started with Elementor: Building and Using Elementor https://elementor.com/help/build-with-the-editor/
Getting Started With Elementor: Layouts
https://elementor.com/help/build-with-the-editor/layouts/
Global Site Settings: Colors, Fonts, Styles
https://elementor.com/help/videos/site-settings-overview/
Important info here: https://scribehow.com/page/Image_Sizes_and_Best_Practices_for_your_Elementor_site__I6xj950tSW-dAsZv0o2fTw
How to Resize and Save an Image in Pixlr X