For a list of expenses you can deduct visit https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/rental-income/completing-form-t776-statement-real-estate-rentals/rental-expenses-you-deduct.html.
For a list of expenses you cannot deduct visit - https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/rental-income/rental-expenses-you-cannot-deduct.html.