A 'group' contains decks, scores, and events. When these are not 'public', you need to join the group to play them.
To create your own decks, scores, or events, you need to create a group, first.

A 'deck' is a collection of prompts. You can create your own deck from within a group of your own.
You can play a deck, or select multiple decks to play at the same time.

A 'walking score' is a series of suggestions, or tasks, in a fixed order, made available at fixed times after starting a score.
You can create your own score from within a group of your own.

An 'event' is a 'score', starting at a particular time. If you join an event, you, and everyone who has joined with you, will get the same tasks presented to them at the same time.
You can chat with participants during the event.

A 'dérive' is a series of cards that were presented to a person, to you, as well as a collection of experiences that the user submitted as a consequence of having been presented with those cards.

You can filter your feed on people you follow, and the collection of the people you follow and who they follow.
You can follow up to 32 people.

The feed shows you submissions from flâneurs, like yourself, connected to the task cards they were handed.
You can only see public submissions, and your own.