I used to be an IT jack of all trades, but retired now so I am free to work on any project I choose.
As an IT Operator at a data centre I acquired some knowledge of a wide variety of hardware, networks, software, databases, programming, support systems etc.
I also have a wide general knowledge and interest in a very wide variety of subjects. I am mostly self taught, although I did study some subjects at university level graduate courses, yet I cannot truly call myself a master of any subject.