birth, marriage and death; church, census, cemetery, military, land, court, and ship passenger records, and the list is growing. Records for some parts of Canada date to the early 1700's.
While you can search all of those collections simultaneously by entering basic criteria (first name, last name, birth and/or death information) on the main search screen at FamilySearch.org, you will get more useful results by searching collections individually. To see the list of collections for Canada, go to FamilySearch.org and click on the Search tab. Scroll down until you see the map of the world, then click on the link for Canada in the list of geographies. Narrow the list of results to a specific province by clicking on the link (Ontario, for example). Keep in mind that any Canada-wide collections (like the 1901 Canada census) will not be included in the province-specific list, even though that province was included in that census.
For more information about researching your ancestors from Canada, see the FamilySearch wiki article on Canada, or stop by the Family History Center.