Epic, Diety.

Techs: Your overarching goal is philosophy, than construction, grabbing needed happiness techs along the way. Pottery first tech always. AH is the second strongest tech in the game because Caravans are better than libraries early if you have a route to an AI civ. Archery should be taken when needed to stop barbs from disrupting workers. Mining/bronze is strong because it reveals iron. Calendar is alright because it's needed on the way to Philo. Trapping/Masonry/Sailing I usually don't want to get before philo, but I get them if the situation calls for it.

Build order: Scout, scout, shrine or Scout, monument, shrine. Early scouting is essential for knowing if archery is needed, what social policy to take, if I should build worker, to grab ruins, and for tech bonus. You want to steal a worker from an AI civ extremely early, or steal from a city state with your warrior at an unprotected CS around turn 30. I want to usually kick out 2 settlers before starting to go for national college, but sometimes I'll use 1 (strong initial settle location, no risk of AI forward settle) or 3 (weak initial settle location, high risk of AI forward settle, playing something like Maya).

Expo/tile strategy: Your main objective with expansions is stopping the AI from taking the tiles you need first, and to grab luxes, and to grab cities with good production potential.

Plain grassland/jungle are useless because they cause unhappiness and give no production. Hill tiles give you two production for 1 population. Plains/forest tiles give you two production for 2 population, and are weaker. Grassland/jungle suck because they won't give any production but lots of unhappiness. Luxeries/bonus tiles are great, although 3 food tiles are only useful with the production to back them up. Gold is nice, largely because you can buy things directly after getting a tech, but it's arguable if even 3 gold is worth giving up 1 production if you aren't bleeding money.

You usually want to have a plan of when you're going to finish your last library and time philosophy to finish at the same time as the library, and you want a plan of how much population is going to be in each city. Going into unhappiness early in the game is actually a surprisingly good strategy, but you want to time things so you'll be at 0 happiness before founding a new city (which immediately works a hill tile) or 0 happiness before growing in every city you have simultaniously. the -production penalty doesn't outweigh the benefit of extra population and who cares about limiting growth when you weren't going to grow anyways?

With liberty you generally want to focus population on cities with bonus/luxery tiles & national college, with tradition you want to focus population on the capital/national college cities (more pop in capital with tradition = more science, production) and growth for the sake of growth actually makes sense early.

Social policy -

General rule of thumb, tradition is better with a good first city, liberty is better with a lousy first city. Tradition in the long run is almost always better if you get the same amount of cities, and the centralization ends up working better for most peacemonger centric victory conditions. Liberty is for when you NEED it to get cities and luxes you wouldn't otherwise, and the early lead + production + faith it tends to lead to lends itself to a domination-centric game. When I run liberty, I feel like I'm shooting myself in the foot to fuck over my AI neighbours in some way.