First, most indicators have tooltips and don't forget about F1 for hotkeys,
(F12 open guide)
Main Interface 1
https://steamcommunity.com/games/1215380/announcements/detail/1836845981247773708
Main Interface 2
https://steamcommunity.com/games/1215380/announcements/detail/1836845981254479889
Characters and labor automation
https://steamcommunity.com/games/1215380/announcements/detail/2118321591893768208
Сitizens Tab
https://steamcommunity.com/games/1215380/announcements/detail/3335421384228853890
Types of Pops and Economic Growth.
https://steamcommunity.com/games/1215380/announcements/detail/3297143333875062451
State Pops
https://steamcommunity.com/games/1215380/announcements/detail/2262443122800944183
Budget expenses
https://steamcommunity.com/games/1215380/announcements/detail/2414440242048603529
Budget revenues.
https://steamcommunity.com/games/1215380/announcements/detail/2414440242064578747
Elements of space game.
https://steamcommunity.com/games/1215380/announcements/detail/2540542299292725072