What's the Best Way to Earn Money and Grow My City Strategically?

So far, I can't make money in the game. I don't understand how this is done yet. At the moment, I earn money for the game using best money making apps. I have downloaded several such applications at once, and by performing elementary tasks, I make a little money. Sometimes it can be up to ten dollars at a time. So I spend this money on building my city in the game. Sometimes I buy groceries at home. It turned out to be very convenient, I'm surprised. At first, I doubted it at all, but in the end, I was convinced.