There are two ways to photograph people; when they know you are photographing them and when they don’t.
Candid photos are the easiest. There is no immediate risk. You can sneak in your shot without having to engage the person. Shoot and run.
Non-candid photos take more guts. You have to interact with the person being photographed. This may be smooth and uneventful but you might also get rejected or have to deal with the other person’s discomfort at being photography.
This takes more than camera skills. It takes people skills, some diplomacy. You have to empathize and sometime persuade. You have to step outside your comfort zone.
It is frequently worth it. Four out of five times people will agreed and you can get a great shot. Occasionally, people balk and then you can politely back off. You may be a little embarrassed, but you’ll get over it.
The best part of having permission to photography someone is that you don’t have to worry about being caught.