With a flash you look first at the guide number, which tells you the power, and after that at whether the model supports the camera's automatic TTL metering or whether the power is set by hand. The second thing to check is the mounting foot: the hot shoe connection is camera-specific, and flashes from different brands are not interchangeable. In studio use, the recycle time between shots and support for wireless triggering also weigh in.
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With a flash you look first at the guide number, which tells you the power, and after that at whether the model supports the camera's automatic TTL metering or whether the power is set by hand. The second thing to check is the mounting foot: the hot shoe connection is camera-specific, and flashes from different brands are not interchangeable. In studio use, the recycle time between shots and support for wireless triggering also weigh in.