Acts of the Apostles

I have never read Acts all the way through but I have read many parts of it. But the one things that I never figured out and I have always wanted to, is who is the author of Acts. In the book, it states at one point that Acts follows Luke and by assumption and most people agree that it was Luke. There are many examples that point to Luke being the author, such as Luke being written in the same style as Acts and Acts directly follows Luke. Although in class we talked about how The Gospels probably weren’t written by Matthew, Mark, Luke or John and were written by people a few years later. So I decided to do so research, but all I could find were many people saying that Luke wrote it or that it was the same author as Luke. So if we agree that Luke wrote the Gospel of Luke then Luke wrote Acts but if we Agree that someone else wrote Luke than that person also wrote Acts. So I guess I’m just getting confused with who wrote what, I mean I guess we will never fully know and we can just make educated guesses. I also guess it doesn’t really matter that message still stands and the message that God wanted to get across did. I feel like we always have conversations and debate about things like this but in the end, it doesn’t really matter if the message God wanted is still getting across.