Mute and Unmute in Zoom Meetings

In Zoom meetings, if you want to Mute/Unmute yourself, you can press Alt + A.
Alternatively, you can hold down the Spacebar while you are speaking and this will unmute temporarily, until you let go of the Spacebar.
If you are a host and you have an issue with background noise with one of your attendees, you can press Alt + M to mute all attendees except yourself.