Discriminate what is true and false

Colossians 2:16-23
There were Legalism and Mysticism among Colossian church.
Legalism :All those things are mere shadows cast before what was to come.
Mysticism : They lost connection with the Head.
Since you died with Christ to the basic principles of this world, why, as though you still belonged to it, d you submit to its rules: "Do not handle DO not Taste! DO not touch!" These are all destined to perish with use, because they are based on human commands and teaching. Such regulations indeed have an appearance of wisdom, with their self-imposed worship, their false humility and their harsh treatment of the body, but they lack any value in restraining sensual indulgence.
By the death the Jewish law has been superseded: the shadow was given way to reality. "Then why behave as though you were still living the life of the world?"
Why?
The false teaching and wrong ideas Paul contests in this letter seem to be a type of Judaism which not only attempted to force the Colossian church back to particular Jewish practices like circumcision, but which also believed that they were the recipients of a special revelation not available to everyone, a revelation which they received while ascending into the heavenly realms. in this letter Paul seeks to draw the Colossian church back to the true worship of Christ the image of the invisible God, the head of the church.
How?
Understand the truth then we can distinguish what is true and false. Pray to the Lord let me have capability to distinguish the truth.