Hi Cheez
To answer your question the best guidline for looking at the relevancy or importance of the commandments is this following passage:
13 And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses;
14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
15 And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.
16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
There are four kinds of laws in the Old Testament: the Moral, Civil, Dietary, and Ceremonial laws. To put it simply, because the laws in the OT were written to the Jews, most doesn’t apply to us who are Gentiles (Goyim = nations). The laws they were to keep had to do with being a model, holy nation (Isaiah 42:6).
Thus, they not only must keep the moral aspect of of the commandments but the three others. If they obey the commandments which includes the keeping of the Sabbath days, months, and years; keep from eating animals with divided hooves such as swine, and offer sacrifices for sins, thanksgiving offerings, etc, they will be exceedingly be blessed in Deuteronomy 28 (if they don’t, they’ll be harshly punished in Ch. 29-30).
However, because the Gentiles are not Jews but of other nations, they don’t have to keep various sacrifices for example, but also because Jesus did away with them.