How can enterprenuership serve as plan B if you don't get a job or acceptance to a Hei

Just like a job, Entrepreneurship is one of the option to generate income.

The thing that differentiate Entrepreneurship and a Job is the potential risk and benefits. Entrepreneurship tend to have higher risk of failure compared to a job. But, it also possess the higher potential of income.

If you don't get a job and want to turn to entrepreneurship, the first things you need to get are ideas & Capital.

Ideas determine the type of business that you want to make along with marketing strategy and market market. Your capital is the resources that you need to make your ideas into reality.

Capital could be obtained from Loan, savings, or investment.

For example, One of the sector with lowest Capital is Software , internet content, or digital marketing. But you have to have enough skill in coding  or art. you can Find the learning resources for practically zero cost online.

d) social security number

let me know if i am correct or not, so i can edit the answer.

it's actually a very difficult task, due to not many people can make 2 million dollars in 2 years. besides that, to the not-so-realistic ideas, you can create a business. it could be practically anything, but make it into a business that isn't that known yet, you get me? also, lets not forget about stock market. that's where all the good stuff happens. use investments at the beginning and begin to raise up your business or whatever you're going to do. as this is a very non-realistic idea, it's still worth the shot!