Best Zoom tips - make sure that you don't sit with your back to a window - even one with the curtains closed. The camera will only be able to see your silhouette (you may prefer this but other people will want to see your face).
Natural light is best if you can, otherwise sit in front of a light source.
(I face into a right-angle with windows on both walls, so I have natural light coming at me at 10 o'clock and 2 o'clock. In the pointed part of the angle between the windows, I have a table light which is raised on a shoebox and two reams of copy paper to get it to the right height ie above my laptop screen. I use this when the natural light is fading or after dark. It gives a clear light which doesn't cast shadows.)
Do pay attention to your background...
Make sure that your clothes neckline doesn't "disappear" off camera. I discovered this by watching myself in a Zoom meeting wearing a cami and an unstructured jacket. The top of the cami disappeared below the screen off camera and it looked as though I was wearing the jacket with nothing underneath it and acres of chest skin showing. Make sure that the camera can "see" the whole of your upper half down to bosom height (it doesn't matter below that, unless you need to get up - to answer the door, perhaps - and then everyone will know that you are wearing ratty tracky bottoms...
Switch your phone (mobile, landline or both) to "silent" mode before you begin the Zoom call. Or be prepared to "mute" yourself quickly if your phone rings.
If you wear make-up normally, wear it for a video call, or you will look pale and washed out. A bit of lip or balm will draw attention to your mouth, and if the sound and picture are synced will make it easier for others to hear what you are saying. I suspect we all "lip-read" to a greater or lesser extent.
If you can afford it, an external microphone gives better sound-quality, as do external speakers.
Final top tips - if you don't like looking at yourself on camera because you think you look "wonky" you can tell Zoom to "mirror" your image so that if your door is on your left in real life, it will show as on your left for you to look at in your Zoom all.
And you can always turn off your video view so that others can see you but you can't see yourself!
(All these tips have been tried, tested and learned the hard way by me...I'm sure other people have other Top Tips that could share?)