My green card was applied together with my father. But I don't quite understand, because my father and I hired a lawyer from China to help us apply for a green card. But not everyone can apply for a green card by hiring a lawyer. First of all, your own materials are complete, which proves that you immigrated to the United States through legal status, and then you pay for a lawyer, just a lawyer who knows a lot. He will help you collect these materials and mail them to the immigration office. Because many people don't know the steps to apply for a green card, almost many people apply for a green card through lawyers.
But if you stay in the United States illegally, you can't apply for a green card under any circumstances.
Or marry an American citizen, and that's all.