Always try to find a private space for online meetings to minimise background noise and to prevent disturbing colleagues or classmates
Try to use headphones rather than the audio and microphone of the device used for the meeting
Always test internet connectivity as well as connecting to the online meeting room a day or two before the meeting to leave enough time for debugging the problem should challenges arise
Always check in to the the meeting at least 15 minutes before the meeting starts to allow some time to debug should internet connectivity or computer setup have changed since your test run