What is “homebrew” and why should anyone do stuff with it? Homebrewing is the term used for creating homemade elements for tabletop roleplaying games. Homebrew is the punk-rock, DIY side of Dungeons & Dragons, and anyone can do it. Players, Dungeon Masters, novices, or experts; anybody can lovingly handcraft custom fantasy aspects for their home games.
Source：https://www.cbr.com/dnd-how-to-start-homebrewing/
