Lutherans do believe in the Real Presence. They do not believe in transubstantiation, as do Catholics, but they still believe that the body and blood of Christ are present in the bread and wine.
As Protestants, Lutherans believe in sola scriptura, which is the idea that the Bible and only the Bible has authority as God’s word. Catholics believe that the Catholic Church has the authority to speak in God’s name.
Lutherans also believe the Protestant doctrine of sola fide, faith alone. That’s the idea that doing good works cannot contribute to your salvation, but salvation is received through abandoning hope in yourself and casting all your dependence on Christ. Once you have received salvation, good works follow as a product of your new heart and new life in Christ.
Also, many Lutheran groups have become very liberal and tolerate all kinds of heresy among their teachers, including the approval of homosexuality. The most conservative Lutherans are the Wisconsin and Missouri Synods.