# Server OS Engineering ยท 1 [Agila University track](https://edu.agilaos.com/track.php?track=24&lang=en) About 15 minutes per lesson. Predict, run, change, explain, then complete the check in University. - [Lesson 1: What makes a server operating system?](lesson-1/lesson.html) - [Lesson 2: Service state and recovery](lesson-2/lesson.html) - [Lesson 3: Accounts and least privilege](lesson-3/lesson.html)