Trigger Javascript on comment submission

I’m trying to develop my first plugin and would like your help. The plugin’s function is to trigger a JavaScript function (Google Analytics tracking code) when a comment is submitted.

I found the comment_post_redirect filter in the Filter/Hook reference (https://codex.www.ads-software.com/Plugin_API/Filter_Reference#Comment.2C_Trackback.2C_and_Ping_Filters) which seems to be ideal but there’s no instructions on how to use them.?

Can someone point me in the right direction? Where do I start??