Monogame is an open source replacement for the XNA game development library. It’s pretty neat, you can do a lot of cross platform stuff that XNA could never do. One of the biggest hassles though is that if you an existing XNA project and want to port it to Monogame, the content files need to be setup in a specific way and there’s really not an easy to do them all at once.
I’m gonna walk you through a couple simple copypasta find/replace tricks I’ve been using. Keep in mind, developing with Mono is always a moving target, so anything I post here is proooobably out of date by the time you read it 😉