A Redmine project is the workspace that holds issues, wiki pages, files, versions, time entries, and member permissions for one team or deliverable. Creating it carefully matters because the identifier becomes part of project URLs and cannot be changed after the first save.
Redmine creates the project shell first, then exposes project settings for issue tracking, modules, members, versions, repositories, forums, and time tracking. The project form controls visibility and enabled modules, while the issue tracking and members tabs confirm which work items and users can operate inside the workspace.
Plan the project identifier, visibility, trackers, and first member role before saving. A private project with no assigned members exists in Redmine, but normal users will not have a team workspace to open until a user or group is added with a role.
Related: How to create a Redmine user
Use a lowercase identifier made from letters, numbers, dashes, or underscores. Redmine locks the identifier after the project is saved.

Trackers appear here only when they exist in Redmine administration.
Related: How to create a Redmine tracker
Enabled modules control which project menu items appear, such as Issue tracking, Wiki, Repository, Calendar, and Gantt.

