This is a day of fast and abstinence. On Good Friday, Catholics aged 18–59 must fast (one full meal, two smaller meals, no snacks). Everyone 14+ must abstain from meat. Fish and animal by-products like cheese or eggs are allowed. The fast is ideally continued until the Easter Vigil. 

Please note that there is a collection on this day for the upkeep of the Holy Places in Jerusalem. Given the destruction taking place in Palestine every day, your support is more necessary than ever.