I found it confusing too so I set about studying and praying as I went. It took a few days but it was so very well worth it! A clear understanding of the old covenant and what is referred to as the new covenant but actual translation from original Aramaic texts show that the correct term is “renewed” covenant.
Experience has shown me over and over that what God says in His Word is true, and most professing Christians would agree with that simple statement. Likewise, it has also been proven that many professing Christians are exactly that – professing to be Christians, all the while having been misled somewhere along the way, into believing that their carnal minds are somehow compatible with the Word of God which is only spiritually discerned. It is not warm and fuzzy. It is many times not logical by our 21st century standards. It is however, the very Words of El ‘Elyon (The Most High God), every one of which we are to live by according to both Deuteronomy 8:3 - He humbled you and let you be hungry, and fed you with manna which you did not know, nor did your fathers know, that He might make you understand that man does not live by bread alone, but man lives by everything that proceeds out of the mouth of the LORD, and Matthew 4:4 - But He answered and said, "It is written, 'MAN SHALL NOT LIVE ON BREAD ALONE, BUT ON EVERY WORD THAT PROCEEDS OUT OF THE MOUTH OF GOD.' "
God likes to use covenants. They are important to Him and should be to us…but they aren’t.
There really is no such thing as “new” and “old” covenants, as we commonly hear in the Christian community - they are different levels of a progressive restoration process.
Then there is the scripture that uses the term “New Covenant” which those who prefer to disregard the Old Testament as being anything more than mere history like to point out. They claim this entirely nullifies the “Old Covenant” or the “Law” and they teach others to ignore what God requires of us, which is to keep the covenants which began with God and Adam. It is always a challenge to think about something we have some degree of familiarity with in a different aspect because we are used to thinking about it a certain way. We are creatures of habit, after all. However, to study for the purpose of learning the truth, this is what must be done.
Obviously, it is of the utmost importance to let scripture speak for itself and to always compare scripture with scripture, taking context into account. Another thing often forgotten is that there are words that have been added that were not in the original text when the KJV was written, and they are the italicized words. The KJV is not my favorite translation but it does clearly show these italicized words which makes it a beneficial version to use when studying alongside other versions or translations.
I found it fascinating and I will be happy to go on if you would like to read more.