A 3-2-1 sequence starts with an establishing shot, then a medium shot, then a medium close up, close up, or extreme close up. This sequence is a good way to start a scene.
A tableau shot films for a long period of time in a wide shot like a theatre production.
It is better to cut frequently rather than zooming and panning in and out of shots as it is very difficult to zoom and pan well.
Avoid flat shots where you film the subject at a 90 degree angle as much as possible, instead use the z-axis to create depth. This is done by angling yourself slightly from the subject.
Follow the 180 degree rule and only film from one side of a conversation so as not to confuse the audience.