Your relay list looks good. Remember the more relays you have the more power it takes if you are on mobile. Lots of relays can drain a battery fast. here is a way to track relays https://nostr.watch/relays/find 
to add them each client will have a place in the settings to add a relay so you just copy the wss and hit join 
Topic specific relays are getting popular now but they are usually paid relays for the purpose of filtering spam or nsfw content. 
To see if a relay is working for you try using https://nostrudel.ninja/#/
you will notice it shows if the relay worked when you send a note. If you are to far from a relay the client might time it out. and some go on and off through the course of the day. 
I would say dont mess with them to much. But i would add 
wss://relay.mostr.pub/  this is a bridge to the fediverse. you will see users from there but if you dont have this relay you cant interact with them https://soapbox.pub/blog/mostr-fediverse-nostr-bridge/ 
keep sending questions. ill help out as much as i can