Beginner code review.

Hello there. I am learning to do web apps using C# and ASP.NET. Did this To-Do List with simple UI and basic CRUD operations. I was using EF Core here and SqlServer database. Could you please take a look at it and give me some advices. My biggest concerns are async db calls as I'm not sure if I am using them properly. Also exception handling almost no idea how to properly deal with them.

Would appreciate any feedback, thanks a lot!