Crouching is bending or stooping down low to the ground. Crouching can be very similar to squatting.
The man in the picture is crouching down so he can take a photograph of something from a good angle.
Video: view
Diving is a sport where you jump into the water, usually from a small platform. Some people dive in so they can start swimming faster. Sometimes people have the diving board set up really high so between jumping off and landing in the water they have time to do lots of acrobatic twists and turns.
Usually when you dive into the water, you want to make as small a splash as possible.
You drag something when you pull it along with much effort. Generally when you drag something, most of it is on the ground and you have to overcome a lot of friction. People often drag things when they don't have something like a wheelbarrow or trolley to help them, and they are too heavy to carry.
When two or more people or animals get angry with each other, sometimes they will fight, and try and hurt each other with words or their fists. Sometimes people fight for money, as in a boxing match or street fighting.
Animals often fight with each other over food, nesting space, or at breeding season.
You can also use fight as a noun, as in "those people are having a fight".
Fis forFly (motion)
Flying is a way of moving through the air. Most things that fly do it because they have wings, but helicopters fly by using a rotor.
A gallop is the fastest gait of a horse. It has a beat of four, and all of the horse's feet are off the ground at once as it is galloping.