As you use your MacBook in various classrooms the control center will become your best friend (top right of your screen)

To choose which speakers your laptop uses:

Click on control center > click on sound > choose the option you want from the drop down (the projectors will have funky names ex. NP…)

To set your MacBook Display to duplicate (so you see it projected):

Click on control center > click on display > click display preference > click on arrangement > check the box for ‘mirror display’

**The shortcut key to jump to this setting should be OPTION KEY + F1