Tags
Create and delete tags from the repository's Tags page. See Branches & Tags for the read-only tag list and tag detail pages.
Create a Tag
Give the new tag a name and a starting point - any existing branch, tag, or commit hash - then choose the tag type.
Lightweight vs. Annotated
A lightweight tag is a plain pointer to a commit, with no message of its own. An annotated tag additionally requires a message, and carries its own author, date, and message independent of the commit it points to - the tag detail page shows this message for annotated tags.
Delete a Tag
A lightweight tag deletes with a single confirmation. An annotated tag requires typing its exact name into a confirmation field before the deletion is accepted, since its message is lost along with the tag.
Both actions require write access to the repository, and can be temporarily refused with a "repository busy" response while another write is in progress - see Merge for details.