Questions about mechanics

[matlajs]

I have recently bought civ 6 and i am doing my first game. Huge, max civs max cs, epic speed, Gilgamesh. Despite me having somewhat experience with civ 5, i don't understand some mechanics in game, especially city yields and policy bonuses for production. In city view it just displays base production yields from terrain+ buildings, but for example Agoge(50% towards ancient, classical units) either doesn't work or i don't see that bonus anyhwere while training units. Also there are many desinformations in descriptions( buildings, units, policies aswell). So i exited a game and i wonder, if those are known bugs or it is just like game works(doesn't) now. Any mods or at least tips? I don't want continue in game, where anything works and half of my decisions are made badly, because of misinterpretation( like Oligarchy +4? cs for all land meele units, actually just for foot soldiers)