Hello there, thank you for the great feedback on the videos! As far as sample company files go, Intuit has a test drive company file with sample data in it. You can use it to practice entering most transactions; however once you log out whatever work you have done will not be saved.
If you have QuickBooks Online, you can access the test drive directly from the Help menu. It should say Sample Company in the drop down. However, if you’re not logged into QBO, use the link below:
All the Best-