1, which should be RCI. The low, medium and high here do not correspond to the low, medium and high when you were building. Low, medium and high RCI refers to income. To put it bluntly, the poor live, the middle class lives, and the rich live. Low, medium and high during the construction period refers to the population density. Low density is generally single-family, medium is apartment, and high is building. Of course, this is a gradual development process. At first, houses were generally short. Low-density villas will eventually develop into small villas with 10 people. High density eventually developed into a building, where thousands of people lived. They may all live in the low, middle and high income classes of RCI.

The demand of RCI determines what kind of income you will eventually develop into. For example, RCI shows that middle-income housing, low-income enterprises and high-tech industries are in high demand, so when you build housing, enterprises and industries, they will develop in these directions.

If the demand for low-and medium-sized units is similar, the house you built should be the above two immediately. If you only want to develop one kind, then if you raise the tax rate that you don't want to develop, his demand will naturally decrease.

2. Education level determines demand. When there was no education at the beginning, there was a great demand for low-housing, low-commerce and heavily polluting industries. It is suggested that primary and secondary schools should be established as soon as possible. If the maintenance fee is too high, reduce the school funds to the current level, and then gradually increase with the increase of population, so does the university. And the library. The sooner these things happen, the sooner high demand will come out. Don't be afraid to lose money in the early stage, just earn it back later.

3. Transportation, electricity and water pipes are necessary for building. If you have a high demand, if you build it, but can't grow, it is usually these problems. Electricity and traffic pictures will show that water doesn't seem to be displayed at the beginning of construction. Water shortage will show up later.

The laying of water pipes is very simple, just longitude and latitude lines. One horizontal and more vertical, one vertical and more horizontal will do, there is no need to cross them all. Pay attention to the radiation surface of a single water pipe, and don't let two parallel water pipes overlap.

Education and medical care are very important to increase the population. Will be built in the early stage.

I've played all the above myself, and I'm a novice.