One way to make money without paying taxes is to live in a home you are renovating to sell so you can claim the principal residence tax exemption. Of course if you do this as a way to make money you are actually operating a business and you owe those taxes anyways, either as capital gains or income taxes.
The CRA is going after people using this loophole to illegally avoid paying taxes and are using third party data to find them. If you are thinking of Reno flips without considering the tax bill, this might not be your best money making strategy.