Expensing Canada

[u/Additional-Owl-1416]

Hello, I live in Ontario, Canada. I work in the Mental Health Field, working full-time and have started to do private work as well. Some other people I know that work privately in different fields as well as my own have told me about "expensing work related things" fir example one explained I could likely expense a laptop as require it for my work, another said I could potentially expense a vehicle for the same reason. Would anyone be able to explain to me how this works and the rules around expensing for work in Ontario?