Oddly enough, that’s a question I’ve been asked a few times in the past few weeks.
There are many choices for this kind of thing. Zoom has a few privacy concerns attached (even if the Prime Minister doesn’t accidentally tweet your meeting ID). Microsoft Teams is pretty decent if you happen to know someone with an account via work (and an employer who doesn’t mind it being used for non-work stuff). HouseParty sucks up battery life like it’s going out of fashion.
My answer, at least for various church things, has been Jitsi Meet – it appears to Just Work and is really simple, since all people have to do is follow the link to the meeting you set up (and enter the password if you set one). It also provides a UK phone number for users to dial in if they don’t have a computer with a camera on it.