My knowledge of Canadian genealogy is somewhat inferior to that of what I know about the same topic for the U.S. Learning more is therefore important as many Irish settled in Canada over the centuries and countless others first arrived on Canadian shores before migrating south to the U.S. This inter-connectedness lends itself to a need for a holistic approach when studying the genealogy of Irish immigrants.
Every genealogist needs somewhere to start when it comes to learning about a new area of interest to their research. For Canada, there is a very succinct introduction to Irish genealogical research on the website of Library and Archives Canada.
You can access the webpage here.