How to use netstat command

My question is what does it mean to LISTEN or ACCEPT on a port as it relates to my example?

Example: I have a tomcat server, and It will use port 8080. I want to make sure that port is available for me to use.

What commands should I perform on my unix server and why?

what information would a command like this give me: netstat -an | grep LISTEN

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2022-07-25 20:39:03
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