Any good guides on how to start with redis and action cable?

I want to get some action cable notifications working on my site. I have never used redis before or action cable. I see there are videos on gorails on action cable that seem to spec that you have redis configured. I'm not sure where to start with all this.

I have my site running within my organization on an ubuntu 18.04 server. Can I run redis on that same server or do I need a separate server for that? I won't have tons of traffic. This is an internal tool we are using with my group.

Any info or suggestions is appreciated.