Remembering to distinguish bioinformatics from biomedical informatics, if you are looking for the latter, I'd suggest extending what you already know - this is a good Link to that start. https://www.coursera.org/learn/clinical-data-management
The reference book on biomedical informatics is the Shortliffe text: https://www.amazon.com/Biomedical-Informatics-Computer-Applications-Biomedicine/dp/0387289860