Hi John,
I found and shared here this youtube video a few weeks ago explaining 3 ways hackers do to steal your stuff. There are some useful tips inside that might interest you (for example, pasting the address on a blank sheet of paper or a notepad, instead of straight on the destination field etc…)
Also the first and top answer on this thread (written by someone working at a famous 3 letters agency) is also worth reading to learn how to check if your computer is compromised (it’s windows but similar on mac) Reddit - Dive into anything