The Bible is composed of 66 books, none of which is less important than any of the others. Some religions teach that it's necessary to study the OT and others teach the same about the NT. However, each one gives the other context, so they are not mutually exclusive. If you would care to, I would be interested in knowing why you converted to Judaism from Christianity. Your life, your choice, I get that. I'm merely curious.
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Christianity had the Trinity to contend with. A Christian does not need to be Trinitarian. I wanted to observe God's Commandments. Jesus instructed to keep and teach the commandments. I accepted that for me, with no obstacle, hindrance, or barrier to keeping all the 613 Commandments each one as it is for me and all of them as a nation, joining with Israel in observance of these. It can be done as a Christian. Observing Torah is not seen as a Christian thing.
As for the word covenant, whether this was the covenant God made with the nation of Israel, the old covenant, the Law of Moses, or the new covenant (which is for the house of Israel and the house of Judah God's law written on minds and hearts in Yeshua HaMashiach Yeshua Messiah Jesus the Christ) I accepted the covenant and my identity had to be Jewish or of Israel or it could be Christian or neither but I was a child when the word covenant came to me either in my mind or by reading studying posting, etc.... It was something that was supernatural or not and had to be contended with or not or it became a part of me even a part of my very being or not, something happened and my life has never been the same (I was even a Christian after this).
Earlier than this I wanted to be of Israel and accept the covenant or the covenant of Moses.
Shalom.
Jacob