OLD TESTAMENT

The Old Testament (abbreviated OT) is the first part of Christian Bibles based primarily upon the Hebrew Bible (or Tanakh), a collection of ancient religious writings by the Israelites.

Genesis

Someone has accurately called Genesis “the seed-plot of the Bible.” The seeds of many plants are sown first in a bed that is prepared for them. When they have grown to a sufficient size and age, they are transferred to the plot of ground in which they are to grow, mature, and bear fruit. This process well illustrates the Book of Genesis. The seed-thought for every fundamental and basic doctrine of the Scriptures was first sown in it and there grew until it was transplanted, figuratively speaking, to some other portion of the Word of God, given later. This statement being true, there is no book more important to the understanding of the Scriptures than this Book of Beginnings. - Ariel Ministries

EXODUS

The book of Exodus details God's call to the people of Israel to get up and leave their position of slavery in Egypt. Exodus records more miracles of God than any other book in the Old Testament. God rescues and delivers his people as he guides them into the unfamiliar desert. There God institutes his system of laws, gives instruction in worship and establishes his people as the nation of Israel. Exodus is a book of tremendous spiritual significance. - ThoughtCo

Leviticus

The book of Leviticus goes into deeper detail about the divine-human relationship put in place on Mount Sinai (Exodus 19–40). Leviticus assumes that Israel is sinful and impure, and it describes how to deal with sin and impurity so that the holy Lord can dwell among his people. Readers may find Leviticus difficult to understand because they lack firsthand experience of the practices it describes. Ritual vs. ethical commands. Chapters 1–16 describe various “ritual” regulations, while chs. 17–27 focus on ethical commands. Because the rituals of chs. 1–16 are unfamiliar, they are often seen as being disconnected from the ethical emphasis of the later chapters. It is more accurate, however, to see the entire book as being concerned with Israel’s being holy to the Lord. - ESV.org