The book of Exodus dedicates significant space to the description of the tabernacle of the Lord. This may be difficult to read through, but it is important to the understanding of the worship of God. The Ark of the Covenant points to Mary (as we can see in Luke 1:35 and in the Visitation of Mary to Elizabeth, similar to 2 Samuel 6, and Revelation 12), and the holy place of the tabernacle and the holy of holies are but a shadow, or type, of what exists in Heaven. This description is seen as well in the book of Revelation.
The Ark of the Covenant is overlaid in gold and a cover called the Mercy Seat, where God is enthroned, is over it, with two cherubim, angels with wings and human faces. Inside were the tablets of the ten commandments, Aaron's staff, and a jar of mana. These things reflect the Word of God, the priesthood, and the bread that came down from Heaven, respectively.
The table of the bread of the presence is also described, which is a table that contains 12 loaves of bread, offered to God but also shared by men and a symbol of God's covenant with man. Also in the holy place is a lampstand, which has a figure of budding almonds, a sign of life which may also be reflected in Num 17:8, where budding almonds also show favor from God.
The tabernacle was a tent that was constructed to be erected whenever they were in a place and was designed to be movable. The tabernacle tent is a box decorated by rich curtains, divided into a large holy place separated by a veil from a much smaller cube of the holy of holies.
God wishes to dwell with His people, to sanctify the space where His holy place is, God asks us to give freely to worship Him in the way that He commands us, and that this sacrifice should be a worship of some value. This reverence and value increases as the holy things get closer to the Ark of the Covenant. Unholy worship can be punished, as were Aaron's sons Nadab and Abihu in Leviticus 10.