Mail tutorial recommendations

I've decided to set up a mail server for me and my family, just because I can. I've never paid much attention to the subject, and the results of DuckDuckGo searches seem to be about a decade old. Ii would welcome pointers/links to reliable, straightforward, and recent soources of information and how-to about installing and configuring mail servers, and a plus if it's on Debian. But I doubt the distro makes a huge difference. I have no specific questions yet, just looking for material to learn from.