Lessons are marked as complete when you've engaged with the full content.
Video lessons
A video lesson is marked complete when you've watched the video through to the end (or close to it). You can skip ahead, but you need to reach the end of the video for it to count.
Article lessons
Article lessons are marked complete when you click the Mark as Complete button at the bottom of the article. This ensures you've scrolled through the entire content.
Quiz lessons
Quiz lessons are marked complete when you submit your answers. You don't necessarily need a perfect score — just completing the quiz is enough (though some courses may require a minimum passing score).
Manual completion
If a lesson doesn't auto-complete, look for the Mark as Complete button. Clicking it will update your progress and award XP.
Re-completing lessons
You can revisit any lesson at any time, but XP is only awarded on first completion.