If you want to learn about Mendix check out: https://gettingstarted.mendixcloud.com/link/home
There are some interested learning paths in the Academy Section. If you have specific questions about a topic, please let u know.
The pro tip about learning movies: pasue the video tutorial and try do it by Your own before the instructor :) It’s more efficency then just watching and follow the instructions – it coul help You learn mednix faster. Good luck!
Also, you can downoad the Company_Expenses app as an example. This helped me in getting a feel for logic.
Did you check the mendix app gallery? It has many different use cases: