Update Zoom:

Ensure latest version installed. Zoom releases frequent updates. Check for updates in the app settings.

Audio Settings:

In Zoom, Settings > Audio. Select correct speaker and microphone. Use Test buttons to verify they work.

Video Settings:

Settings > Video. Select correct camera. Close other apps using camera. Only one app can access camera at once.

Low Video Quality:

Check internet speed. Close bandwidth-heavy applications. Use Ethernet instead of WiFi for stability.

Virtual Background Issues:

Requires powerful CPU. Settings > Background & Effects > "I have a green screen." Disable if causing problems.

Close Other Applications:

Zoom is resource-intensive. Close unnecessary apps. Especially browsers with many tabs.

Conclusion:

Most Zoom problems come from wrong device selection or slow internet. Updates and correct settings usually resolve issues.