# Concepts

- [Spaces & space groups](/get-started/concepts/spaces-and-space-groups.md): Spaces are a foundational container for discussions, courses, events, chat, and image posts in Circle.
- [Posts](/get-started/concepts/posts.md): An overview of posts on Circle
- [Messages](/get-started/concepts/messages.md): Circle supports messaging via direct messages, group chat rooms, and chat spaces.
- [TipTap editor](/get-started/concepts/tiptap-editor.md)
- [File uploads](/get-started/concepts/file-uploads.md)
- [Rich Text Body](/get-started/concepts/rich-text-body.md)