Regulation of the offerings

Leviticus 6:1-30
When he thus sins and becomes guilty, he must return what he has stolen or taken by extortion or what was entrusted to him, or the lost property he found, or whatever it was he swore falsely about. He must make restitution in full, add a fifth of the value to it and give it all to the owner on the day he presents his guilt offering.
Burnt offering:Every morning the priest is to add firewood and arrange the burnt offering on the fire and burn the fat of the fellowship offerings on it. The fire must be kept burning on the altar continuously.
Grain offering: This is the offering Aaron and his sons to bring to the Lord on the day he is anointed: a tenth of an ephah of fine flour as a regular grain offering, half of it in the morning and half in the evening. Every grain offering of a priest shall be burned completely; it must not be eaten.
Sin offering: The priest who  offers it shall eat it; it is to be eaten in a holy place, in the courtyard of the Tent of Meeting. But any sin offering whose blood is brought into the Tent of Meeting to make atonement in the Holy Place must not be eaten; it must be burned.
Why?
A tenth of an ephah of fine flour is about 2 liters.
Restitution(歸還) is not only full return, but add fifth of the value to it. It is the penalty to this sin.
Keep fire on the altar is the job of priests. Keep praise to the Lord.
How?
All these regulation were told to the Israelite, so as the words of God has told to us through Bible.