Keep the commandments of the Creator given throughout the Scriptures, with the understanding that our heavenly Father does not change.  The Torah, the first five books, gives all of the guidance, direction, and teaching that Yahweh wanted us to have.  The remainder of Scripture is written in the form of history, commentary, and eyewitness reports about Messiah and the New Covenant in his blood.  Thus, we learn from teaching and from examples.

Messiah said:

Matt 5:18 (NIV) I tell you the truth, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law (Torah) until everything is accomplished.
19 Anyone who breaks one of the least of these commandments and teaches others to do the same will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven.
20 For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven [kingdom of Yahweh]. (Since, the Jews had stopped using the name, Yahweh, "heaven" was often substituted in such phrases).

For one’s righteousness to "surpass that of the Pharisees and the teachers of the law," one must live it;  the Pharisees were being criticized as hypocrites for teaching the law, but not living it.

Matt 23:3 (NIV) So you must obey them and do everything they tell you. But do not do what they do, for they do not practice what they preach.

Following Torah includes keeping the weekly, seventh day Sabbath (Exo 20:8) and using the name of our Father that he told us to use (Exo 3:15, Ps 68:4), "Yahweh."

The Hebrew Bible is referred to as "TeNaKh" (also spelled Tanakh and Tenach); this term refers to the three part division of the Hebrew Bible, with T standing for Torah ("Law"), N standing for Nebi’im ("Prophets"), and K standing for Ketubim ("Writings").
In Matthew 22:40, Messiah refers to the "Law and the Prophets"; he would have said "Torah and Nebi’im."  "On these two commandments hang all the Torah and Nebi’im."  To keep these two commandments, one must live in agreement with all the Torah and Prophet Scriptures.
Messiah’s words about the Law / Torah  (in Matthew 5 above) are quite clear.
Also, quite clear are statements by John:

1Joh 5:3 (KJS) For this is the love of [Yahweh], that we keep his commandments: and his commandments are not grievous.
1Joh 3:4 (KJS) Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.

We walk in this way, with the understanding that the Father’s forgiveness is obtained when we each repent, obey his commandments, and identify by faith with an atoning sacrifice.

To repent is to cease unrighteousness and walk in righteousness.(1)

Obey his commandments:
We love our heavenly Father and we love others by following His guidance, direction, and teaching for our lives, Torah (2).

Identify with an atoning sacrifice by faith:
"The New Covenant in His blood" is that the atoning sacrifice of  Messiah exceeds the animal sacrifices which required the many priests, utensils of service, and rituals.  We must now identify (Lev 4:23-24) with the Messiah’s sacrifice and receive atonement by faith in Messiah, rather than by the works of the animal sacrifices of the Law.

Ezek 18:21 (KJS) But if the wicked will turn from all his sins that he hath committed, and keep all my statutes, and do that which is lawful and right, he shall surely live, he shall not die.
22 All his transgressions that he hath committed, they shall not be mentioned unto him: in his righteousness that he hath done he shall live.
23 Have I any pleasure at all that the wicked should die? saith [Yahweh, The Mighty One]: [and] not that he should return from his ways, and live?
24 But when the righteous turneth away from his righteousness, and committeth iniquity, [and] doeth according to all the abominations that the wicked [man] doeth, shall he live? All his righteousness that he hath done shall not be mentioned: in his trespass that he hath trespassed, and in his sin that he hath sinned, in them shall he die.
25 Yet ye say, The way of [Yahweh] is not equal. Hear now, O house of Israel; Is not my way equal? are not your ways unequal?
26 When a righteous [man] turneth away from his righteousness, and committeth iniquity, and dieth in them; for his iniquity that he hath done shall he die.
27 Again, when the wicked [man] turneth away from his wickedness that he hath committed, and doeth that which is lawful and right, he shall save his soul alive.
28 Because he considereth, and turneth away from all his transgressions that he hath committed, he shall surely live, he shall not die.
"Torah" is a Hebrew word that comes from a root that means to throw or cast as a spear or arrow.  Hence, to aim toward the mark.  Torah itself means teaching, guidance, direction.
The Hebrew word for sin comes from the root khaw-taw', which means to miss.  Hence, to miss the mark.