Kate, I just got an Instant Pot for Christmas and haven't done anything but the water test yet, but I have seen many posts regarding accessories. I joined a couple of groups on Facebook - Instant Pot for Beginners and Instant Pot Beginners Recipes and Tips. There is also an Instagram blog called instantpot_cooking that talks about accessories, has links to recipes, and even has some videos in her stories with step-by-step instructions. Most of the posts I've seen mention buying extra sealing rings, a steamer basket, and a 7-inch springform pan for cheesecakes.