Yes there are multiple classifications of electricians, each with their own restrictions of what they can and can’t do ( ie 02 residential “ think houses and apartment buildings under 5 stories”, 06 low voltage “ fire alarm, multimedia systems”) as well as a few others. Those classifications can for the most part only stick to that certain specialty. An 01 typically does any commercial space or industrial ( think high rise buildings, schools, factories) but they are unrestricted, so can legally do the other classifications of work as well.

The best way to become an electrician is to go down to the union hall and apply for the apprenticeship, however there is also an avenue to go the non union route which can be less wait time , but you won’t get as good of benefits or things like a triple retirement.