Problems with Google Meet can be grouped into three basic categories. Software issues, hardware issues, and Internet issues.
Software issues include problems like your web browser crashing or the app failing to launch. Hardware issues, which are most common on PC and Mac, are related to a problem with your webcam and/or microphone. Internet issues are caused by spotty Internet connectivity or a problem with Google Meet's online services.
While the source of your problem can vary, focusing on these three issues will usually resolve the problem and get Google Meet working again.