Albert Barnes Commentary Acts 15:29

"that ye abstain from things sacrificed to idols, and from blood, and from things strangled, and from fornication; from which if ye keep yourselves, it shall be well with you. Fare ye well." — Acts 15:29 (ASV)

From meats offered to idols. This explains what is meant by pollutions of idols (Acts 15:20).

You shall do well. You will do what ought to be done in regard to the subjects of dispute.