alsa and zoom

[kalpana]

I am using Ubuntu 20.04.5 LTS Focal Fossa instaalled a thied party software ZOOM
in the instalition was some sugestion about instaling Alsa as this computer is 6-8 year old and was using winwows 10 for short time because ubuntu 16 would not installed itself
I finaly instaled ububtu 16 xxx abd make many upgrade
Questions : /
1 how canIi check if Alsa is installed on computer
2 can i use Zoom to its full capacity w/o Alsa
3 /how to install Alsa
4 any better software then Alsa
5. a usb Dynamiv microphone Matter?
Eli