There is an age old prohibition that basically says, “Don’t major in the minors”. It seems to me that is what Paul is saying here as well.
Another way this is said is “Keep the main thing the main thing.” The main thing here is hold to Jesus Christ as our head, the ultimate authority in faith and practice.
That means that in our spiritual lives, knowing the teachings of Jesus is far more important than any religious rite, ritual, or regulation. And it means that putting those teachings into practice is far more important than worrying about what we eat, how someone is baptized, what holy days one does or does not observe.
When we don’t know what Jesus taught, it is all too easy for us to be taken captive by false gods and deceitful messiahs. Sadly, I have seen this happen many times, over and over again through the years. Unfamiliar with what Jesus had to say, people are led astray from the truth into empty and even destructive beliefs.
Practically speaking, to put this passage into practice, I might start reading something like Jesus’ “Sermon on the Mount”, found in Matthew 5-7. I’d read it one section at a time, starting with the first 12 verses which are called the Beatitudes, and consider what it would mean for my life to put what Jesus is teaching into everyday practice. So, for instance, we might take one Beatitude a day and say, “How am I doing at living this?”
Keep the main thing the main thing. Follow Jesus.