Good friday represents the day Jesus Christ died. It marks the beginning of the 3 days it took for Jesus to conquer death, hell, and the grave. Eggs are much older than Easter, and both eggs and rabbits are age-old fertility symbols.
Easter eggs are hollow because how hollow the rock was when jesus rose from the dead. I’ve researched that in the old days easter eggs were hard boiled eggs and painted all over. Kids all around the world in the 1800 use to roll the hard boiled egg down a hill. To symbol the rock that covered the cave that jesus christ was in rolled down the hill