This is related to the question discussed here. Both question discuss the same passage.
Quoting from the verse given by user
therefore, that we should not make it difficult for the Gentiles who
are turning to God.
What was difficult for gentiles turning to God ?
Difficulty was following the Law as we can see in verse 5 (NLT)
some of the believers who belonged to the sect of the Pharisees stood
up and insisted, “The Gentile converts must be circumcised and
required to follow the law of Moses.”
The conclusion was that gentiles should not be burdened by the Law of Moses
why are you now challenging God by burdening the Gentile believers with
a yoke that neither we nor our ancestors were able to bear?
Then as I explained in question quoted, leaders given some concessions considering that complete disregard of Law should not be a stumbling block to Jewish Christians. Considering "For the law of Moses has been preached in every city from
the earliest times and is read in the synagogues on every Sabbath", they asked Gentile believers to observe just four things, two which are affirmed elsewhere in the New Testament: food offered to idols and sexual immorality. So I believe those principles are binding to us even today, and another two (eating the meat of strangled animals, and consuming blood), which appear more to the situation at hand (strong views of Jewish Christians).
So I believe in summary, this do not call for observing the law, but re-affirming that salvation is not by Law, but by Grace as pointed out already by a_hardin.