Exporting data to Excel or CSV works the same no matter what table you're exporting from. Sometimes there is a stand-alone Export button, but it's often in an Other Actions menu button. This article will show screenshots of a few different places where exporting is available.
Exporting Data From the People Table
How to Export a Course List from a Course
Go to Courses > Courses > Edit a Course > Scroll Down to the Registrations tab