First of all let you know about Excahnges.
Exchanges are price discovery mechanism of a particular product or asset. Where exchange is a intermediate between buyers and sellers. Both buyer and sellers on exchanges are anonymus to each other.
When buyer dominates then the price of asset increases (pump) and when seller dominates then the price of asset move down (dump).
Every exchange offer different assets to trade but it does not means that you will get same asset on every exchange. Before entering to the exchanges you must know that your tradeable asset available on that particular exchange where you are going to open the account.
You must have to know about there are exchanges which we can divide them into the grades according to their services.
Gade A exchanges provide better user interface, adance analysis tools and fast service
Grade B exchanges with moderate user interface and little slow service
Grade C exchanges are slow in working and worse service you may see and sometimes you may face withdrawal problems.
Grade D exchanges may struck your funds compeletly. So, choose your exchanges wisely.