Fringes, tied in a specific way on the four corners of a tallit or prayer shawl. The purpose of tzitizit is to remind Jews of the mitzvot (commandments).
At the beginning of the Passover seder, the youngest person asks the Four Questions. Here's a handy guide to the questions in English and Hebrew, with a downloadable melody and printable version.
Don't be overwhelmed by hosting your own seder. Use this handy checklist to help you prepare!