Not hints for winning at Deity, but at least for getting a basic gameplay going:
-You want every city to contribute to you winning. It's pretty useless to put a city in a horrible spot and not do anything to help it. But you also don't want to spend a ton of effort on a marginal gain.
-Remember that cities will not work every tile. That means that you don't need to put cities at a "max" distance from each other, but can pack them in a little closer. You also don't need improvements on every tile, either!
-Chopping is your friend. A simple beginner's guide should really be "chop every non-river forest and every jungle", and right there you're probably 50% of the way towards winning
-Generally speaking, feel free to take a very limited view to your actions. Your science is falling behind your culture? Build a campus/library. Running out of money? Commerce hub, or next time you choose a trade route send it to a city-state instead of an internal route. Running into the housing cap in your city? Build a granary. Low on amenities? Build an entertainment complex. Or even simpler, just place whatever district has the highest bonus available. You have a spot for a +3 industrial zone? Just take it
-Make sure you are ready in case an AI declares war on you. It can be as simple as keeping a couple archers around that you can quickly upgrade, or even just having enough cash/faith available to rush a couple units.
-When placing districts, place commerce hubs on rivers, campus/holy site next to mountains, and harbors next to the city centre, ideally adjacent to at least one seafood resource too. Try to place for the best adjacency that you can early, but later in the game, don't worry about that nearly as much. If you're pulling in 100 science per turn, the difference between a +1 campus and a +2 campus is basically a rounding error. The exception is that now getting a +3 or higher campus gives a bigger bonus to buildings if running the cards.
-Think in triangles: Farm triangles are the simplest way to get the food bonuses as you move along the tech tree, and district triangles get increased bonuses too.
-When fighting, bring twice as much range/siege units as you think you need, and half as many melee units.
-Don't be afraid to declare war and not immediately advance on an enemy. My current game I declared on Scythia, and despite me being way ahead in tech, I started moving in towards her city. But then she came back at me with a ton of archers and horsemen, and actually managed to pick off a couple of my advancing crossbows. Sometimes it can pay off to declare way, take a cheap city on the border, and then wait for their army to advance on you. Once you kill their first wave of units, they don't usually come with many more, so at that point you can be a little more aggressive.
The true Deity players would disagree with a lot of what I said here, I'm sure. But if you follow these simple rules, it should work well enough. And just remember, if in doubt, build a campus. Too much science is never a problem
