Hi Stamp Collector - Unless you plan on going on a binge purchasing expensive early classic Canada you may want to focus on how to spot stamps that have been regummed, repaired and reperforated. Those will be what you come across the most in your journey.
PS: Learning how to spot the three "R"s will pay dividends no matter what area you collect, not just Canada.
This is also great info. Do you have any good specific resources on this?
Regards