1. About several means of transportation

Transportation mainly includes trains, planes and helicopters. Personally, I think the helicopter is mainly for earning experience, if you desperately want to upgrade, you can choose to send more helicopters. Aircraft are mainly used to get gems, building materials and other items, but the requirements are also higher. And I think the most important thing is the train, the train can be exchanged for building materials and gunpowder, etc.. Building materials are the most important part of development, and they are rare because they cannot be purchased through gold in most cases. As long as the building materials are used to build buildings, the population can be expanded and more factories can be built. So my advice is to send more trains in the early stage.

2. About selective construction of factories.

The above mentioned the importance of trains, there is an institute in the factory and building, through the institute can shorten the sending time of trains, but also to speed up the manufacturing. The construction of factories requires both sufficient population and a large amount of gold, so there is a need to be selective in the construction of many factories. Personally, I think the more important factories to focus on are the sugar factory, dairy, bakery and rubber factory. These factories produce the basic materials and therefore need to be produced constantly, and therefore need to be developed as a priority.

3. About the rational use of cash.

Personally, I think it is reasonable to use it for merchants, buying building materials and expanding the factory grid. Building materials are a very important part of the development chain, while the expansion grid can make full use of time when offline, largely increasing the production speed.