Place the lids and bands on the jars. Tighten bands just until you feel resistance (you don’t want to overtighten the bands).
Fill a boiling-water canner (or large, deep Dutch oven fitted with a round, metal cooling rack) about half full with water. Bring to a full simmer. Lower the filled jars into the simmering water one at a time with a jar lifter or use a canning rack to lower all the jars into the water at once. (If your canning pot does not have a canning rack, a wire rack on the bottom of the pot is recommended to prevent the jars from breaking.) Check the water level. If the water does not cover the jars by 1 to 2 inches, add boiling water as needed. Bring to a rolling boil, cover the pot and boil for 10 minutes if using 4-, 8- or 12-ounce jars or for 15 minutes if using 16-ounce jars. (Check individual preserve recipes for more specific processing times.) Let cool for 10 minutes before removing the jars from the pot.