Hi, I am glad to hear that you are interested in banking. There are many different types of banking business and different roles within each business. Generally speaking, there are retail banking, private banking, corporate banking, transaction banking, investment banking, etc. The business run under each of different types of banking is quite different. On the other hand, there are different roles in the business, e.g. Sales, Relationship Manager, Client Services, Operations, etc. It really depends on what are interested in.
In fact, there are many resources/information online. You can find out more. On the other hand, you can also try to speak to someone who works in banking to find out more information. If you are interested to develop your career in banking, I would suggest you can explore any intern opportunity to work in the bank. You can have better understanding.
Hope this helps! Good Luck!