I think these videos are fundamental when using PowerApps with SharePoint. You not only save your nerves, but also unnecessary workarounds -> Because with this tip you can interact easily and directly in the PowerApp.
I personally use the knowledge especially in SharePoint Customized Forms (with PowerApps). I don’t use LookUp columns or similar in the SharePoint list, but only within the app. So I have a better and easier control, where I can directly enter the functions without using any long “code snippets”.