God makes the world, but very quickly human sins ruin everything. How will God fix the brokenness? He starts by choosing a man named Abram (Abraham), and he promises Abram that he would have many descendants, he will be blessed and would be famous and he will give land to his offspring.
Abraham had many descendants, but they ended up living in Egypt in slavery. This was not the land and blessed lite God was talking about! The people cried out to God and he raised up Moses who led them out of Egypt.
Turn back to God!
Eventually they got to God's promised land, but instead of living a life obeying God and being blessed, they turned their backs on God and worshipped false gods instead.
The people asked for a king. God made a promise to one of the kings, David, that his family would always rule God's people.One day a king would come and bring the promised blessing to the whole world. This king would be called 'the Messiah' or'Christ'.
Most of the Kings after David rejected God and led the people to worship idols. But God still loved his people. He sent prophets to warn them to turn back, otherwise they would be sent into Exile, away from the promised land. Unfortunately the people didn't listen, and enemies Assyria and then Babylon, invaded and wiped Israel out.
Eventually, some of God's people were able to return to the promised land, and began the process of rebuilding, but it was never as good as it was before. By the end of the Old Testament God's people are still waiting... waiting for God's promises to be fulfilled. Where was their blessing? Where was their Messiah?....