Basic Lutheran Beliefs

Sola Gratia
We are saved by the Grace of God alone, not by anything we do;

Sola Fide
Our salvation is through faith alone; we need only to believe that our sins are forgiven for Christ's sake, who died to redeem us;

Sola Scriptura
The Bible is the only norm of doctrine and life; the only true standard by which teachings and doctrines are to be judged.

Another of Luther's principals was that Scripture and worship need  to be in the language of the people.