A good Bible trivia question from Genesis 25 is who was Abraham’s second wife? You will see Abraham’s last recorded act of faithfulness to God when he sends his other sons away from Isaac. This is because he wanted to avoid any conflict over who was to receive the inheritance. God told Abraham that Isaac was to be the recipient and Abraham wanted to ensure that would happen.
After Abraham’s full life has ended he is “gathered to his people.” This is a very interesting study for you. Generally when a faithful man dies in the OT, the Scriptures say that he was “gathered to his people.” There is a theory that faithful men (and women) of the Old Testament, did not go straight to heaven, but were gathered in a waiting place called Sheol. Christ came and declared His victory over sin after His death and they ascended into heaven. Jesus tells a parable in Luke 16:19-31 that gives credence to this idea (though it is only a parable). This is only a theory, though not totally unreasonable.
Isaac and his family are the focus of the second half of this chapter and you are about to witness an extremely dysfunctional family. Verse 28 is obvious foreshadowing of the impending drama. You also see more obviously here a theme in the book of Genesis. That theme is that God is going to choose who He wants to choose. Esau should have been the one to receive the blessing from God, but instead God chooses Jacob. Remember that God explicitly told them that Jacob was to be the one to receive the blessing since this will be important later.
The last story seems absolutely ridiculous. Even though Jacob took advantage of the situation, Esau is the one whom the author blames. He must have been incredibly short-sighted to give up his future for something to eat. Rarely does the Bible blatantly criticize someone’s actions, usually it just shows the consequences. Here the author makes a point to say what Esau did was wrong.