I've never heard of some of the maps in the current rotation, what's the deal with them?

That market one, I assume you don't start trading with that until lategame like you would anyway? Unless your own market is denied. Maybe Spanish more viable for a change? Italians? Not much use until lategame mind. The crater one looks like it might be quite small so you kind of use Socotra strats - lots of aggression, maybe pre-Mill drush?

I'm quite inexperienced in a lot of ways so new maps can throw me a bit if there's a very obvious meta that I'm not aware of (I got whipped on Atacama because I completely lost control of the wooded area and then realised I didn't have any left and it turns out Indians destroy everything on African Clearing).

I am more familiar with Hideout but not actually what the meta is, I assume trushing is pretty strong, maybe Donjon rushing these days as well?

Valley I sort of know as well, I guess the meta there is Mongols or Mongols, and if you get bored then there's always Mongols. Or, joking aside, I guess good farming/berry/herdable civs if you don't want to risk going for the hunt?

I don't necessarily need to follow the meta but it's nice to know what it is so I know what to predict from other players.

Cheers!