A user story is a short description of a feature from the point of view of the person who wants it, usually written as "As a [user], I want [goal] so that [reason]".
User stories keep the focus on who benefits and why, instead of on technical detail. They are small enough to finish in a single sprint and carry acceptance criteria that say when they are done.
Example
"As a team lead, I want to see who is on holiday next week so that I can plan the sprint realistically."
The INVEST checklist
Good stories are Independent, Negotiable, Valuable, Estimable, Small and Testable.
User stories in Starlex
Create issues of type story, group them in epics, estimate with story points and split them into sub-tasks. See issue tracking.