There's a handful of recipe sites I tend to stick to. Smitten Kitchen, All Recipes, Serious Eats, NYT Cooking. I also have a few favorite cooking books: On Food and Cooking, Joy of Cooking, The Art of Simple Food. Then I have some speciality cooking books for desserts, ice creams, and soups.
My wife transcribes recipes we really like to 4" x 6" index cards. The recipe box is up to probably about 200-300 recipes we've collected over our 25 years together.
FWIW, on current iPadOS, Only Recipe isn't showing up in the Share menu for me.