20 Teach them his decrees and instructions, and show them the way they are to live and how they are to behave.

Read Exodus 18:20 Using Other Translations

And thou shalt teach them ordinances and laws, and shalt shew them the way wherein they must walk, and the work that they must do.
and you shall warn them about the statutes and the laws, and make them know the way in which they must walk and what they must do.
Teach them God’s decrees, and give them his instructions. Show them how to conduct their lives.