Do I have to use a flash when shooting on location?

If you want to pursue better results (not just taking clear facial photos at night), it is necessary to tell you clearly, unless the natural light at that time is perfect (which is definitely rare and basically does not exist). But at the same time, there is also a problem, that is, when shooting outdoors, the venue time is very limited, and there may be no time for you to arrange the lights. If you are alone, there is no one to help you use the light, because good lighting effects are usually off-mirror, and you probably need someone to help you use the light. Besides, it doesn't make much sense if there is only one lamp. If you want to play with lights, you have to use a soft mask or something to achieve the effect (one can't talk much). I suggest you go to the website of Flash Knowledge first. There are many introduction posts on it. You can also go to Uncle Tu to see other people's photos and lights. All of the above are my own experience in playing SLR for two years.