https://www.techradar.com/news/best-flashgun

The same flashgun won’t suit everybody. Some of us want something small, lightweight and simple to use, others might want a high-end model that’s really power-packed and full of advanced features. It’s equally true that some flashguns are vastly more expensive than others and, if you’ve got an entry-level DSLR, it doesn’t make sense to spend more on your flashgun than your camera.

Whatever level of sophistication and price point you decide on, a flashgun is an amazingly versatile accessory. It’s supremely portable and can make a huge difference to the quality of lighting in almost any scenario, from night-time shots and gloomy interiors, to portraits on a bright sunny day.