I believe understating of lighting techniques is the easiest way to improve photography skills. Dslr Camera internal flash is the first source of lighting as we starting using DSLR camera. But there are some tricks by using them we can make camera internal flash useful for taking good looking pictures. Just don't fall you camera flash directly toward your subject instead bounce it back from other surfaces. you can place your hand in front of flash or use some white material to diffuse the light.