Matt Colville's 5e D&D-does-battles supplement is 320-pages long, but I'm pleased to say you don't need to learn a 320-page wargame to get the most out of it. Not even close.
Matt Colville's company, MCDM, has launched a new D&D magazine. It's called Arcadia and its a test.
In the sci-fi game, characters are on an alien world that has become home with cultures to understand and enemies to defeat.