In these categories you will find buildings that provide services for your followers to be happy.

Energy, Water and Sewage, Garbage

In this tabs you will find things that are critical for the city to function. If at the beginning you lacked funds to distribute electricity or water, you can as well just start all over from the beginning

Garbage becomes important immediately after buildings related to them become available. Citizens won't want to live in polluted territories, so it is a critical elements for the growth of your city.

Important buildings are: Water pumping station that allows you to reduce sewage amount and Incineration plant that allows you to resign from landfills and produce electricity.

Healthcare and funeral services, Police, Fire

Healthcare and funeral service is one building category.

These categories have one small and one large building to serve their functions. For smaller cities smaller buildings will be completely enough, but if you see that a small fire house is not enough to handle fire in oil refinery district, then maybe it is time to change it for a bigger one?

Crematorium is absolutely mandatory building from the healthcare category. It allows you to safely bury dead people as ashes instead of coffins, which allow you to save place on the cemeteries.

Education

A well educated society allows buildings to quickly gain new levels.

If you won't provide education to your city, then you will never have higher level buildings. People won't ask too much about it, but it is only up to you whether you want more income, as higher level buildings can have more taxes.

Only weakness of schooling is that schools must be placed pretty often in districts with high population density.

Transportation

All communication types except for roads can be found in this category:

• Buses - they are cheap and efficiently reduce traffic of automobiles.
• Railway - building railroads is a very hard task, but delivering goods directly to industrial centers is of great help
• Metro - stations above the ground take very little place and all the traffic take place under ground. Should be build wisely as maintaining them is very expensive, but it gives great profits for the traffic on the ground.
• Ports - if you have the ability to build a port, it will allow you to send massive amounts of commodities beyond city borders. It will reduce transport costs, which means it can increase tax income.
• Airports - similarly to ports, but focused more on human transportation. It can transport a great amount of businessman and tourists.

Recreation, Monuments and Special Buildings

In this category you can find parks, playgrounds and squares. Those are rather large buildings that are required in every district. They improve your buildings level.

Additionally, you can find here single trees and park paths in case you feel like creating a second Central Park.

Special buildings require fulfilling specific conditions which usually aren't too hard. These are unique buildings and most of them are require for meting requirements for monuments.

Monuments are special unique buildings for unlocking which you must meet certain conditions like placing specific buildings, improving (or reducing) happiness in specific category or having enough citizens.