Basic Orthodox Lutheranism is:
We believe in the One Triune God - Father, Son, and Holy Spirit.
We confess the three ecumenical creeds of the Christian faith; namely, the Apostle's, Nicene, and Athanasian Creed.
We believe that the Holy Bible is the infallible and inerrant Word of God in both the Old and New Testaments.
The core doctrines that came out of the Reformation in 1517 that we teach by are known as the 5 solas (the 5 "alone" statements):
-To the Glory of God Alone
God the Father works through His Son, Jesus Christ, through the power of His Spirit to bring to faith.
We cannot by our own reason or strength believe in Jesus Christ or come to Him, but the Holy Spirit has called us by the Gospel, enlightened us with His gifts, sanctifies and keeps us in the one true faith.
Christ is the atonement for our sins. He paid the price on the cross, with His precious and innocent blood, so that all may be His own and live under Him in His kingdom which has no end.
To those who receive this Gospel, and in that way, come to faith, the Gospel of Christ crucified for the forgiveness of sins, He will raise from the dead at the last day and bring into His everlasting kingdom for all eternity.
We condemn good works as a means to salvation. Good works come from the fruits of the Spirit and are made holy through and by faith, not because of our own merit or any goodness in us, but by simply learning to use the benefits of Christ's atonement for us.
We do not believe or preach a "prosperity gospel." In this world you will have sufferings but take heart, Christ has overcome the world (John 16:33). Our theology stems from a theology of the cross, not from a theology of self-glorification.
We believe in the 3 chief means of grace: The Word, Water (baptism), and Sacrament (the Lord's Supper).
Our worship services are liturgical. That means that in them, God comes to us by these means of grace and we receive His good gifts as He prepares, strengthens, and preserves our hearts and minds in Christ Jesus to live daily in His Word, live daily in our baptisms, and weekly feed on His body and blood in His holy testament so that we reflect His glory, are united with Him, and then are sent out to go and serve others.