Its my sincers advise never to use any online sources to write a SOP/LOE, this is a very bad idea and can lead to a straight visa refusal, VO wants to know your story in your own words the moment the find out you SOP is a copied one they will straightaway refuse your visa.Write you own SOP, menton about your program , yourself and your family, answer why you chose a particular university or college and canada as your study destination, also explain how the program you have chosen is in progression to your previous education/work experience and how its going to help you on your return back to your home country to further your career growth,explain ties to your home country by mentioning about your parents , properties, or you have secured a job already and after you complete your program in canada you will be joining the company in your home country on your return, you must secure this in written form that company as well.
Good luck
