“Christian, your heart is new, not wicked!”

What exactly is our new heart? Where is it located? What purpose does it serve? Can you expound upon the deep meaning of Galatians 2:20? How should we navigate tough decisions like what movies to watch?

Do we “help” God? Do we have to “put Him first”? If so, how?

Why did Jesus tell people to “be perfect” when He knew we couldn’t? What does it mean to have a new heart? A new spirit? What about our minds? Are they new or being renewed? I tell my friends that I don’t have to help Jesus, and they look at me strangely. Am I right?