Read, Read, Read. If you want to understand you must read. For this subject I would suggest reading the book of Exodus, and then Hebrews. Exodus shows you the old sanctuary, and Hebrews shows how Christ fulfilled it.
“Thy way, O God, is in the santuary”. Psalm 77:13
God’s plan of salvation for manking was taught to us in the Old Testament Temple. The Temple in the Old Testament was a replica of God’s sanctuary in heaven.
“Who serve unto the example, and shadow of heavenly things, as Moses was admonished of God when He was about to make the tabernacle: for, see, saith He, that thou make all things according to the pattern shewed thee in the mount” Hebrews 8:5
Moses saw God’s throne in heaven, and His sanctuary, and build a replica on earth.
At the temple there was an outer courtyard.In the courtyard there was an alter for burnt offerings (Exodus 27:1-8), which symbolized the cross of Christ. And there was a bath of laver where the priests washed before entering the temple. The laver represented cleansing from sin (Exodus 30:17-21, 38:8, Titus 3:5).
The temple was a gold overlaid building, with two compartments. The first room was called the holy place. Inside was the table of shewbread (Exodus 25:23-30), which represented Jesus, the bread of life (John chapter 6). There was a seven branch candlestick (Exodus 25:31-40), which represented Jesus --the light of the world (John 1:9, 9:5). The oil in the candlesticks represented the Holy Spirit (Zechariah 4:1-6, Revelation 4:5). And thirdly there was an alter of incencse which represented the prayers of God’s people (Exodus 30:7-8, Revelation 5:8).
Finally there was the second room called the Most holy place, or the Holy of Holies. The only thing inside the holy of holies was the ark of the covenant (Exodus 25:10-22). The Ark was a gold overlaid box. Inside it was the Ten Commandments, and a golden pot of manna. On top of the ark was the Mercy seat, and on each side there were two cherubs of gold. The Ten Commandments are the law of God’s kingdom and standard of judgement. The pot of manna was placed inside the ark of the covenant as an eternal reminder that God fed the Israelites with manna in the desert. Also, God tested the Israelites by making manna fall on six days but none on the Sabbath. The manna spoiled if kept overnight so it needed to be gathered anew every day. But, God made the manna on the sixth day keep overnight, so that the Israelites did not rely on themselves for food on the Sabbath. And this pot of manna in the ark was a reminded of this as well. As an eternal mermorial, God told Moses to put a pot of manna in the ark (Read Exodus ch. 16, Hebrews 9:2-5). Finally there was Aarons rod inside the ark as well.
The Mercy seat represented God’s throne in heaven. The two cherubs of gold were symbolic of the two angels which are on each side of God’s throne (Psalm 80:1)(Exodus 25:17-22). the Mercy seat was above the commandments, which represented that as long as God’s people confessed and forsook their sins, they would be given mercy. The sins of the people were forgiven when blood was sprinkled on the mercy seat by the priest (Leviticus 16:15, 16). The priest represented Jesus who would appear in heaven itself before God for us. “For if He were on earth, He should not be a priest…” Hebrews 8:4
The blood of animals was our schoolteacher to show us that Jesus would sacrifice himself for our sins. "…without the shedding of blood there is no remission… Hebrews 9:22. But Jesus said “This is my blood of the new testament, which is shed for many for the remission of sins” Matthew 26:28