.NET 5 - The breaking changes you need to know about

.NET 5 is here, and it's incredible! But... yes, there's a but. With all good things also come to some less good things. After all, it's impossible to make an omelet without breaking a few eggs, and .NET 5 is no exception. If you try to migrate from .NET Core 3.1 to .NET 5 you may run into a few breaking changes. Before jumping in with that migration and taking advantage of all the new features, make sure you have considered what may break first.