We keep the covenant by obeying the Torah's commands and beliefs. There are hundreds of examples.
The laws have various reasons. Some (such as the Passover) serve to reenact or remember events of our history.
Some (such as saying the Shema-prayer) serve to reiterate our belief in God.
Some of the laws (such as those of ritual purity and kosher food) serve to sanctify us.
Some (such as the laws of torts) serve to maintain an orderly and just society.
Some (such as the law against breaking a vow) serve to prevent bad character traits.
Some (such as the command to offer help) serve to engender good character traits.
And all of the commands serve to subjugate us to God's will (especially those commands for which no explanation is easily apparent).
Some examples of the commands:
Putting on Tefillin (a.k.a. phylacteries) in the morning
The sukkah-booth during Sukkot
Avoiding leavened products in Passover
Not eating on Yom Kippur
Not working on the Shabbat
Paying workers on time
Marital rights for one's wife
Counting the days of the Omer
Returning lost objects when feasible
Wearing the tzitzith-garment
Learning Torah
Marrying and having children
Educating one's children in Judaism
Giving tzedakah (charity)
Honoring one's parents
And many more.
Note that the Torah "as is" isn't exactly what Judaism observes. Rather, It's the Torah together with the details provided in the Talmud, which is the Oral Law that was handed down together with the laws of Moses. Otherwise, the verses of the Torah often lack enough detail to be fulfilled as is.
See also:
What are the teachings, practices, principles and beliefs of Judaism?
The law (the Torah) specifies the details of its observance, without which one might tend to slowly slacken off.
By keeping the Torah, which is our part of the covenant.
By keeping the Torah's commands.
The second covenant was the one that God gave at Mount Sinai, which reinforced the covenant that God had given to Abraham, and told the Jews what they would have to do as their side of the covenant. God again promised to stay with the Jews and never to abandon them, because they were his chosen people. (see the related link)
It is the covenant with God as expressed through the Torah.
Some of them were!
he didnt... no offense to the big guy here, but moshe and the yehudim were pretty must on their/our own
God will curse those who curse the Jews
It is God's covenant and its mitzvoth (commands) are binding upon Jews.
Because of our covenant with Him (Exodus ch.19).
Because the co-signer was God himself.
Abraham, the patriarch of the Jewish faith. God made a Covenant with Abraham.
1) The circumcision which Jews do. 2) The bestowal of the Holy Land to the Jews (genesis ch.17).
The covenant made with God was permanent and unbreakable. So if God exists, the Jews will always be his chosen people.
Because of the covenant with God. God's giving of the Torah on Mount Sinai was so unforgettable that there was (for loyal Jews) never any question of abandoning it.