I picked up both the base game and the Rise & Fall expansion the other day and I'm getting demolished. I haven't played a Civ game since 4, so I don't remember much about general strategy (and the few things I do remember are probably completely counterproductive in this game).
I looked up beginner guides for Rise & Fall, but most of them (understandably) focus on the new systems added in this expansion rather than big picture best practices. There are a lot of big picture guides for the base game written in 2016 and 2017, but it seems like R&F has changed enough core mechanics that "the fundamentals" described in the guides might not be so fundamental any more.
Or am I just overthinking this (as I often do)?