Some more tips I thought of:
~ look in your manual for the amount of liquid needed for your PC to generate enough steam for the pressure - too little and the food may burn and not cook correctly; too much and you might have lots of very hot water dripping around the edges of the pot while cooking
~ store the lid upside down on the pot, it saves the sealing rings from extra wear
~ pressure cookers and pressure canners are two different things; a canner is much larger to hold canning jars filled with food for processing for long storage
~ a cleaner like Barkeeper's Friend will clean up a stainless PC easily
~ notice if your PC has two fill lines inside the pot; the lower one is for items like soup and stew that completely fill the interior; the higher line is the uppermost level that bulky food should reach, like a pot roast sitting in some cooking liquids - the height of the roast should not go past the upper line
~ when cooking cubes of meat, it is helpful to have the cubes all the same approximate size (my mom's stewed beef was always my favorite dish that she made when I was growing up)
Hope this helps those starting out with their pressure cooker!