The camera gimbal holds the camera for you and can move the camera direction according to your command. There are a number of camera gimbals out there. You can choose any type, depending on your demand and camera size and specification. If you want to use a DSLR camera, you should use a bigger gimbal and, if you use a point and shoot type camera or action camera, you may use small- or medium-sized gimbals. There are two types of gimbals, a brushless gimbal and a standard gimbal. The standard gimbal has servo motors and gears. If you use an FPV camera, then a standard gimbal with a 2-axis manual mount is the best option. The standard gimbal is not heavy; it is lightweight and not expensive. The best thing is you will not need an external controller board for your standard camera gimbal. The brushless gimbal is for professional aero photographers. It is smooth and can shoot videos or photos with better quality. The brushless gimbal will need an external controller board for your drone and the brushless gimbal is heavier than the standard gimbal. Choosing the best gimbal is one of the hard things for a photographer, as the stabilization of the image is a must for photoshoots. If you cannot control the camera from the ground, then using a gimbal is worthless.

The following picture shows a number of gimbals:

After choosing your camera and the gimbal, the first thing is to mount the gimbal and the camera to the drone. Make sure the mount is firm, but not too hard, because it will make the camera shake while flying the drone. You may use the Styrofoam or rubber pieces that came with the gimbal to reduce the vibration and make the image stable.