Schools sometimes charge a certain deposit after formal admission, but it will be used to deduct tuition fees, so don't worry.

To get a visa, you usually need to deposit a sum of money in a bank card as proof of deposit, which proves that you have the ability to pay tuition and living expenses.

You don't have to give this money to anyone. Save for a few months and then go to the visa. After the visa arrives, it can be thawed.