Where to learn things about the Bible:

Check out:

www.theopedia.com

It has a search bar and you can search for many things about Christianity.

For example, check out a few definitions from the site -

Sin:"Sin is any lack of conformity, active or passive, to the moral law of God. This may be a matter of act, of thought, or of inner disposition or state," (Millard Erickson, Christian Theology, 578).
The theological term for the study if sin is hamartiology from the Greek hamartia for sin, error, or missing the mark. The Apostle Paul used the verb hamartano when he wrote, “For all have sinned, and come short of the glory of God” (Romans 3:23)

Law:The Law is a term used to refer narrowly to the Ten Commandments (also called the "Decalogue"; cf. Exodus 20:2-17 and Deuteronomy 5:6-21), and more broadly to the first five books of the Old Testament (or Pentateuch, also the Torah), but especially to the material found in chapters 20-40 of the book of Exodus, the whole book of Leviticus, and chapters 5-30 of the book of Deuteronomy. The Law establishes the fundamental principles and specific commands which distinguished Israel as God's chosen people and governed their social relations and worship of God.
As Christians, we are released from the condemnation of the Law, which exposed our sin and rightly condemned us to hell.

Gospel:The Gospel is the foundation of Christian theology, setting it apart from other all other religions, particularly other Judeo-Christian-Muslim traditions, by the manner in which it relays the hope of salvation. The word gospel originates from the meaning of the New Testament Greek word evangelion meaning "good news". This meaning was transmitted literally into Old English as godspell, eventually becoming gospel. The Gospel is epitomized by Jesus Christ in the following proclamation: "The time is fulfilled, and the kingdom of God has come near; repent, and believe in the good news." (Mark 1:15)

Reformed Theology:Reformation theology represents the thought, doctrines and teachings of the theologians from the Reformation era (1400 - 1650).

Check it out, its worth your time
:)

tim.
reformata.