What is Milk?

To put it simply, Milk is the basics of the Faith that you must learn before you are ready to receive the deeper,  weightier teachings and prophecy from God.  It is explained in Hebrews chapter 5 as such:

Hebrew 5:12-14  "For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.  For every one that useth milk is unskilful in the word of righteousness: for he is a babe.  But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil." 

In Isaiah It says this:

Isaiah 28:9-12  "Whom shall he teach knowledge? and whom shall he make to understand doctrine? them that are weaned from the milk, and drawn from the breasts.  For precept must be upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little:   For with stammering lips and another tongue will he speak to this people.  To whom he said, this is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear." 

Peter says: 

1 Peter 2:2  "As newborn babes, desire the sincere milk of the word, that ye may grow thereby:

If so be ye have tasted that the Lord is gracious.  

Hebrews chapter 6 continues the dialog in chapter 5 to explain the first principles of Christ: 

Hebrews 6:1-3  Therefore leaving the principles of the doctrine of Christ, let us go on unto perfection; not laying again the foundation of repentance from dead works, and of faith toward God,  Of the doctrine of baptisms, and of laying on of hands, and of resurrection of the dead, and of eternal judgment.  And this will we do, if God permit.   

Dead Works

So, what is a "dead work"?  The Christian church by-in-large conflates all the types of works in the Bible into one and the same thing--and this is not so!  The dead works of the law is "sacrificial law" or the case law that was "added for transgression until the seed would come; that seed which is Christ" (Galatians 3:16-19).  Sacrificial Law was "nailed to the cross" (Colossians 2:14), which contains "handwritten ordinances and statutes" written by Moses' fingers in a book.  It is more commonly referred to in scripture as the "Law of Moses" or the "Book of the Law."  This book is not the whole of Torah, even tough books like Strong's concordance and the definition of the word is called Torah, but specifically it is the scroll that was placed on the side of the Ark "as a witness against them, until it was finished" (Deuteronomy 31:24).  This scroll is the book of Deuteronomy, the second instruction, which Israel was required to read once every seven years in Jerusalem.  This Law is not the same as the Law of God, which is the Ten Commandments.  So, in Christ's time, the Jews who went to the letter of sacrificial law and performed the duties (going through the motions) of the points of the law, checking off all the boxes of their traditions, were not considering the Spirit behind the Law, nor were they in obedience to God in full faith.  This lack of hearing and understanding and going to the letter lead many Jews into a trap of traditions of men, which created such things as polluted Sabbaths and Feasts.  This is why it is called a "dead work".  A dead work is also a "work of men's hands," which comes in many forms like making a graven image or building a temple of hewn stone; but, a dead work is something a human does based on their desire and imagination, to do things their own way instead of obeying God His way!   Sacrificial Law was added as a yoke of burdens, which was originally intended to show Israel that it was simply much easier to obey God's 10 Commandments instead of inventing forms of worship by man's hands.   This yoke of burdens was also a punishment to the House of Aaron who had to "bear the iniquity" of Israel's transgressions.  This yoke is a "yoke that the fathers couldn't bear" ( Matthew 11:29-30, Acts 15:10, Ezekiel 20:25-26, Galatians 5:1).  So, the first principle from Christ is to repent from dead works--so stop doing them; and go on to have true faith in God, which means to obey His Ten Commandments! 

Doctrine of Baptisms

The other principles like the "doctrine of Baptisms" and the "Laying on of Hands" is explained more in the link above, but simply put it has to do with teaching people God's Name and his doctrine, which is His Law.  It is about "washing the inside of the cup", which is ultimately the heart; clearing out all the pollutions of this world so that God's Word can be received in full faith.  Baptism is not about getting wet or jumping in a tub or in a river--it is not a literal washing, but a washing by the Holy Spirit after you repent!  Learning God's Ten Commandments as it says in many places allows one to receive the "Holy Spirit, even the Spirit of Truth" (Acts 5:32 / John 14:15-24).  The Holy Spirit seals you for the Day of Redemption. 

Resurrections of the Dead and Eternal Judgment

The resurrection of Christ is a testimony of the Power of God.  This doctrine involves the witness of Christ as the True Prophet God promised to send to "teach everything desired at Horeb" (Deuteronomy 18:15-22);  who was nailed to a cross and had to die so that the "Yoke of burdens" (aka sacrificial law) could be done away with, and God's people Israel (like a wife) could remarry Him after a long separation, opening the door for Covenant marriage.  The requirement is that a person must be "born again" in a newness of Spirit and of obedience and faith.  This is the core teaching of the "Gospel", and it involves a "Refreshed Covenant," which is the Ten Commandments--an eternal Law for a Kingdom people.