Create a new component, or upgrade one that already ships. Nothing you make here reaches a campaign until it is published.
The components that ship in the repo. Upgrading one creates an authored version that overrides it — reversible at any time by unpublishing.
The structural half of a campaign — which components, in what order — with no copy. A layout answers "what does a range launch look like" once, instead of from memory each time.
The palette and type ramp every component inherits. These are the highest blast-radius controls in the Studio — each swatch shows how many components it touches before you change it.