Hi,
Upon landing in Toronto you have to do the mandatory COVID tests in the airport which is free of cost. Post then you can go anywhere in Ontario and follow the 14 day quarantine at home or preferred location. If you are going to any other province from Toronto then tests are not required in the airport but you may have to follow the quarantine rules as per the province. The mandatory 3 day hotel quarantine rule is currently not in place as of now.