Ok so I originally thought that I was going to put the section on measuring current with your multimeter here, right after the power. But half of what there is to say about measuring current is just safety stuff about how to do it safely.

The dangerous part of measuring current is that it's surprisingly easy to accidentally create what's called a short circuit, which can damage the multimeter and quickly drain your battery. So here's a brief section on short circuits and why they're bad. Then in the next section we'll go over how to properly measure current, while safely avoiding creating a short circuit.