Some of this is good advice but I recommend evaluating every protest, having a real plan for transportation and a buddy system, and trying to be as secure as possible by default and only making exceptions when necessary.

Most of the guide is about phones and how they can leak information. The only surefire way to prevent your phone from leaking location information to show you were at a protest is to leave it at home. That should be your default. The next option is to use a burner, but you must be very careful about when you charge your burner and turn it on, as you never want it to be on near where you live or work. Cell signals can be triangulated to a few block radius. The next option is put your phone in airplane mode and turn it off. Your phone is now an emergency device, you won't turn it in at the protest unless a safety critical situation develops, such as being separated from your group by police or other right wing violence. Under no circumstances should you use your main phone to coordinate day-of at any event. If you are an organizer, use a burner to do this. This is also a reason to not use Signal for day-of coordination, as it will pressure you to either turn your burner on at home so that you can coordinate or associate your signal account with other devices traceable to your home or work. Walky talkies are best but Signal alternatives like davel suggested are also better.

Also, cover your face and wear sunglasses.