Echo when speaking

Hello,

This article should help with your echo and background noise issues. 

https://support.zoom.us/hc/en-us/articles/360046244692-Configuring-professional-audio-settings-for-Zoom-Meetings

If this response helps, please accept the answer as an accepted solution, so others can benefit as well.

There are few reasons which can lead to this:
A participant has both the computer and telephone audio active. The speakers on participants' computers or telephones are too close to each other. There are multiple computers with active audio in the same conference room.