3 most important things to know for an oncology nurse

Okay. So for the past year I have been working as a psychiatric nurse at private psych hospital (new grad, first RN job).

I recently decided I needed to get out of psych to keep up my skills as RN including critical thinking skills ..and current employment has VERY limited medical treatment (no IV's, caths, ports, transfusions, ...) so I applied for medical hospital on oncology unit

And I got hired!!!!! I am excited but now I am getting TERRIFIED!!

I want to know what are the 3 most important areas to review for oncology nursing. I feel I have the compassion, patience, hardworking-always willing to help out other staff members going for me, (and some basic level of nursing knowledge) BUT

I am worried I will look like an idiot my first day, since @my psych nursing job I didn't need to perform hardly any medical skills. I want to know SPECIFIC areas to focus on before my first day of training on the unit so no one thinks I am an idiot!

Any oncology nurses-maybe who have acted as preceptors to new RN's to unit and found areas you expect them to know? Please let me know.