1. Even if you aren't using an external microphone, you should wear headphones to check the built-in sound.
2. It's better to move the camera closer than zoom in.
3. Keep people aligned to the same side so as to not create confusion in the sequence.
4. Tripods are better to use because the shaking of a handheld camera distracts viewers.
5. The eyes of a subject should always be on the third, with "talking space" in front of them.