Chapter 20 Notes

[scottkuhl]

Many-to-Many relationship mapping is about to get a major upgrade in .NET 5 releasing later this year. You will no longer need a class for the join table.
dotnet/efcore#19003

This is the simplest writeup I have seen so far on the change:
https://daveabrock.com/2020/08/29/dotnet-stacks-14

BTW, just a reminder on my previous notes that will affect a lot of the content. .NET Core in v5 will now just be .NET going forward. Core has been dropped from the name.