I am still not terribly familiar with Visual Studio and .NET. As a result, I put all my forms and modules in a solution instead of a project.

(1) Was this stupid? Or it does not matter?

(2) Is it easy to move them to a project?

At present, I do not have solutions with more than one project. A solution and a project are the same for me at present. In Build also, I noticed that I could either build the project or the solution. I have not figured out which way is the best. I have been building the solution every time.