Can I study code first using the examples from versions 4.1?
You can but avoid using the EDMX approach, which is already outdated. -asp-net-mvc-application "> The best tutorial I know is this and soon I should be writing a course in Portuguese with several additions. If interested, only manifest by comment.
Does it really change that much?
The point is that several things were dropped, like what I said about the EDMX above. The problem with EDMX is that it requires the central template file to always be up to date, and does not allow for a very extensive tailoring of the fields and validations of your Models .
Today's approach focuses on making the programmer as free as possible for design possibilities, and EDMX does a lot of that.