I decided to try my hand at canning but I know absolutely nothing about it. I have purchased a 10 qt. Fagor Splendid Pressure Cooker and it came with directions on cooking and canning and I have read and re-read all of it. Is there a difference other than size between the pressure cooker and the canner? I have also found an 8 inch rack to fit the bottom of the pot. If there is a difference, why would it come with canning directions, too? Any help and advice would be very much appreciated! Thanks!