My friends and I really like Civ 5, but we didn't get into 6 much and had some reservations about the changes in 7. I think we'll get it at some point, but it will probably be during a sale after some more polish (and maybe some mods to adjust some of the controversial changes).
But I've had the itch from the hype and I've been wanting to try some other turn-based 4X games. Old World is 75% off on Steam at the moment so I pulled the trigger yesterday. I've seen gameplay but I'm eager to try it myself. The narrative choices seem like they add a lot of meaningful decision-making that I want to explore. I also played some Age of Wonders 4 and have enjoyed that too, but there's a lot to learn with all the combat mechanics. It means there's a lot of replayability though.
People are linking good guides to inventing the important stuff, but you should also know that you can download wikipedia. The text-only English snapshot as of 2025-03-01 was 25 GB, so fairly reasonable to include on a flash drive, laptop, or phone. Just make sure you charge your device before time travelling.