The altar of burnt offering is interesting. There were four horns on the four corner posts. They were symbols of help and refuge. They symbolized the atoning power of the altar. Some of the blood was put on the horns of the horns of the altar and there were blood put on the base. The pots were to remove the ashes. The pots to capture the blood of the animals slain beside the altar and to sprinkle the blood at the base. The three-pronged forks for arranging the sacrifice or removing the priests' portion from the container. The fire pans probably for carrying fire from the altar of burnt offering to the altar of incense inside the Holy Place.
The grating placed between the top and bottom of the box structure. Since the intense heat of the fire built inside the upper part of the altar would have eventually destroyed it. I believe the hollow altar was designed to be filled with earth when it was in use.
The nice things is this. Jesus has fulfilled the altar of burn offering. He died on the cross and conquered death.
We don't need to sacrifice animals but accept Jesus in our lives. We need to repent from our sins and follow Jesus.