Most of these are specifically Linux or developer things. While they are nerds, they’re just one very specific subset of the nerd kingdom. You don’t necessarily need to know what these are unless you’re getting into self-hosting, Linux, or software development.

Federated is the only term that might be useful to a general Lemmy user. It just describes the way that Lemmy talks to itself (through instances sharing posts with each other to make the separate websites run as one service) or to other services like Mastodon or the like, which are part of the larger “Fediverse.”