Warning in Visual Studio

I’m a novice with unreal 4. I’m learning how to use Unreal 4 at Unreal Engine CPP Quick Start | Unreal Engine 5.1 Documentation.

I can compile the code, but there are a lot of warning in Visual Studio 2017. How can I remove these warning?
Such as the FloatingActor.h could not be find.

If your project would have really issues with finding all these files and functions it wouldn’t compile (errors would be displayed, not warnings). I guess it’s indexing issue on the Visual Studio side. When you create project it builds database which is then used for auto-completion and few other fancy things. You can try to refresh it (rebuild the database). If it won’t work you can always try to delete your Visual Studio project and generate it once again (right mouse button on the unreal project).