For Christians, Good Friday is celebrated to mark the resurrection of Jesus Christ. This is a whole week festival in Christian Calendar. Jesus death is commemorated on Good Friday, followed by the Easter the day he came back to life. There are many popular Easter traditions, like giving chocolate eggs. And on Good Friday, it's tradition to eat fish rather than meat.
The tradition stems from the Roman Catholic custom to not eat warm-blooded animals on Fridays, to acknowledge and do penance for the death of Jesus. According to Christianity, Jesus sacrificed his flesh on Good Friday, when he was executed on and died for our sins. This is why the Church encourages followers to abstain from meaty flesh on the anniversary of Christ’s death.
Tradition led this to become a rule for Good Fridays, and fish was the common meal of choice.
Easter is the celebration of the last week of Jesus’ life, his death and the Resurrection, and for Christians, it also means the start of new life. It is said to be the oldest Christian holiday which honours the resurrection of Jesus three days after His crucifixion.
It comes after the 40 days of Lent that sees many Christians forgoing something or giving up their favourite foods or vices in order to mimic Jesus’ sacrifice in the desert. Following Easter, there is the Easter season which lasts 50 days until Pentecost.