Their goal is to encourage the adoption of the fediverse by providing an extensive guide and lists of resources for the community. It uses the hashtags found on your profile to establish what your interests are. All you have to do is to add a supplied hasthtag #fedi22
to your profile, and then add the URL or webfinger for your profile.
Most ActivityPub projects are supported (eg. Mastodon, Pixelfed, Hubzilla, etc), and your profile will automatically be re-crawled after 7 days so that updated hashtags can be linked.
The bespoke fediverse guide