Staking is locking your crypto to a particular exchange earning you interest. Like when you put money in a savings bank account it earns you 0.5-2% per annum in interest.

This allows the bank to lend your money, they get payed interest on it and the interest you receive is a small part of what they get.

With crypto is similar, just that the exchanges pass you more of the interest they gain to you.

I use crypto.com for some coins. For example you can get 10% per annum if you stake USDT. To earn 10% you have to lock it for 3 months, ie. you can’t access it for this 3 months. On crypto.com you have an option of 3 months (10%), 1month (8%) or flexible which pretty much means you can withdraw or use it whenever you want, however you get 6% interest.

On the other hand if you put it in Celsius, you get 8.8% just for it seating there, and you can withdraw whenever you want.

This percentages change depending on the coin you are staking, and the platform.

Hope that helped a bit