点明to show how

• 指点道路

  point out the road

• 指点迷津

  give someone guidance

• 他指点给我看，哪一颗星是织女星。

  He showed me which star was Vega.

• 老农指点我怎样除草。

  The farmer showed me how to weed.

挑剔毛病to gossip about someone's faults