You modify items — that is, models, files, and tags — in the database by saving a commit on a branch. The set of changes in such a commit can be categorized as:

Commits involving the first category of changes have a direct correspondence with the table entries in The Versions Window — each version is saved in a commit. The latter two categories, which do not save new versions, only appear in The Commits Window.

You can provide an optional commit comment when saving a new commit. Oftentimes a comment describing the changes is already suggested. The comments can later be read, for example, from the Commits window and from the Versions window.