What does Leviticus 4:15 mean?

He’ll put some of the blood on the horns of the altar where incense is burned in God’s presence. The rest of the blood he’ll pour out at the base of the altar for burnt offerings, at the entrance to the tent. Leviticus 4:15 - Modern Text Bible

(The blood is applied to the most sacred places, showing the seriousness of the sin and the need for cleansing.)