Like many musicians who teach I moved my students to online lessons when the Pandemic lockdown began 12 months ago, back in March 2020... While this way of teaching instruments has become the norm, trying to teach music in real time with all the glitches, sound and latency issues on Zoom/Skype/Facetime/Webex etc., etc.. is never going to replace face to face lessons!
All that aside, things are improving on the digital platform front and there are a lot of measures you can take to make sure that what you use functions to the best of its ability.
If you use Zoom check this out this guide to audio settings:
Or this for Skype:
Sometimes though, whatever you try, it's just down the internet speed in your street, the sheer number of current users or next door using their microwave oven... 😰
Here's to hoping we can all return to something more like normal life soon!