These days most of the things are happening online and you need more than ever to do everything online. There are a few free and paid alternatives to host your online meetings like zoom and jitsi. Zoom has some security problems and the best way would be to have your own server where you host JITSI to not rely on other things.
JITSI is an open-source project that you can use to install a conference server and use it on your domain with your own server. This option is the best for small businesses that need something free and secure.
In the below video the complete tutorial with what you need to do to have a JITSI meet server on Debian/Ubuntu on a DigitalOcean droplet. The Video is done by https://nerdonthestreet.com/ and is containing all the install steps and commands that you need to do to have a complete password-protected JITSI server.
The complete list with commands you can find on his site: https://nerdonthestreet.com/wiki?find=Host+a+Jitsi+Meet+Server