Basically these offerings were to be made from the heart in obedience to God's commands given to Moses on the mountain top which also included the designs and furnishings for the Tabernacle and the sanctuary of the Lord. Within the Tabernacle built by hands God dwelt therein with the children of Israel through His Shekinah glory that filled the Tabernacle.
The purpose was in God demanding obedience to come from the heart which is the intimate place of our relationship with Him. Now the Tabernacle and sanctuary of the Lord dwells in us as there is no more Tabernacle/Temple made by hands, 1 Corinthians 3:16, 17. God knows who are His own by the relationship they have with Him. Along with the commands of God brings us blessings for obedience or cursing for disobedience, Deuteronomy 28-30.