What conditions do humans need to meet if they want to immigrate to Mars? When do you think humans will land on Mars?

If human beings want to immigrate to Mars, on the one hand, they must have transportation conditions that can be used for immigration, such as large high-speed planes; In addition, Mars must also have the conditions for human beings to live like the earth, be able to grow crops, have enough fresh water and so on. However, if human beings really want to immigrate to Mars, they have a long way to go.