If you are guilty, you should first look at yourself before God, repent and admit your sin, and then you can accept it. If you don't repent to God seriously, you can't accept it, because to accept the Eucharist with your own sins is to eat and drink your own sins.
Non-believers and unwashed believers cannot receive the Eucharist. Christianity has only two great gifts, namely baptism and Eucharist. Many Christian family members will take their children to be baptized, and then listen to the priest's teaching and follow God's teaching.
Not everyone can have communion after Sunday worship. You must be baptized first, there is no money. You can offer it if you like. You should pray during the Eucharist, then eat bread and drink wine. Bread represents the body of the Lord, and wine represents the blood of the Lord. The whole Eucharist represents us and commemorates the crucifixion of the Lord for us.