Moses reminds the people how big a deal their liberation from Egypt was, and proclaims that the festival of the Lord will occur every year to commemorate the event.
This was the guy who said he wasn't qualified to do the job. Just look at him now!
Circumcision is established as a way to mark God's covenant on males.
In a not-so-great turn of events, God steers the Israelites away from the land he promised them. He does this because the Philistines, a coastal nation, are in the way of Canaan, the land God promised the Israelites.
God is worried that if the Israelites get into a war with the Philistines, they will forget that he, God, just saved them. So they go the long way around.
God leads the people "in a pillar of cloud by day," and "a pillar of fire by night" (13:21-22). Whoa.
Moses takes the bones of Joseph with him because Joseph had wanted to be moved with his people.