To discover your patronus, you can take a quiz on various websites such as Pottermore, BuzzFeed, Heywise, BrainFall, and Potter Quizzes. The patronus charm is a defensive spell that produces a silver, animal guardian used to protect a witch or wizard against Dementors. Each patronus takes the form of a different animal that has a special affinity with the caster. The animal that your patronus takes the form of can be any animal or magical creature and is unique to the spell caster, taking on a shape that projects their personality.

To find out what your patronus is, you can take a quiz that will ask you a series of questions and provide you with an answer at the end. The questions are designed to help you summon up your happiest memory, which is the key to casting the patronus charm. Once you have answered all the questions, the quiz will reveal your patronus.

It is important to note that the quizzes are not official and are just for fun. The only way to get an official patronus is to take the quiz on Pottermore, which was created by J.K. Rowling herself.