Finding the images on the 1921 Canadian Census difficult to read? In an effort to make the process of deciphering these images a little less painful, here again is a link to the 1921 Enumerator Instruction booklet from the Canadian Century Research Infrastructure project:
The booklet gives a complete breakdown of the questions each enumerator had to go through during each visit. Explanations for the information contained in the column headings begins at the bottom of page 18.
Want something even simpler? Here is a sample image of a 1921 census sheet with the headings at the top.