This is one of the most fundamental video editing tips out there. The easiest way to make a cut invisible is to cut during some sort of movement. This can be the movement of a character, such as a head turn, hand gesture, or a punch. Or, you can cut on the movement of the camera itself. Often the camera will pan, dolly, tilt and whip around the screen. Cutting on these movements will help to mask your edits and create a more seamless experience for the viewer.