There are lot of resources available, depending on the type of cancer you want to know aout. Simply GOOGLE the type of cancer to start. There are organizations for just about every type of cancer. A simple site to start with is the American Cancer Society. Also if you're looking for information of more detail try the National Cancer Institute. You can olso go to your local library and they most likely have some books on cancer, altho check the dates because they may be old and not much help,
This can give you a starting point. If you are more specific to the type of cancer, I or someone may be able to direct you in a more specific direction.
Wishing you the best on this journey
gj