How to have a Strong Faith?

To be honest, when I became a Christian,
a lot changed in me. The Lord has changed me. But now that I want to know the Lord completely, I am confused because of the many things I hear. I don’t know if what I hear is right or wrong.
I want to focus on God. How can I resist temptations so that I can focus on the Lord?
Did you get to the point where you became anxious as a Christian?