Information
Empire Summary shows how much damage protection you got left, amounts of planets and colonies (top 3 colonies can be lost when you leave dp), a list of battles won and lost, etc...
Important Events shows your last battles, market sales, artifacts uses, etc...
Economy
Manage Colonies shows all your colonies, keep the big ones (700-1000 land) plunder the rest, keep 3 junk ones at top for borders.
Projects Your capsule lab, and where you cluster your planets.
Market well you buy and sell stuff here
Slave Empires if you have any enslaved you have a list of em here, also where you withdraw their tribute. if you are enslaved you can declare independence here if you are ten times above your masters power rating.
Science
Explore you find new planets here if you have built scouts, remember to disband them when you are not exploring, their upkeep is big.
Research research infrastructure and ships, focus on one type of infra, commerce or agri for terrans, mining or housing for miners, agri or housing for collectives, commerce or housing for virals, housing for guards and marauders.
Artifacts a list of all artifacts you have(also where you use them, focus on this Later)
Military
Build Ships yes you build ships there
Manage Fleet you disband ships here
Intelligence you can look up an empire and see his empire summary here
Attack yep you attack here (can also do it from the Ranking in the top bar --->rank near me)
Battle Logs a list of your recent battles, with noted pr, opponent and win/loss
this is what you wanted?