An "if" line that gives Scout good advice is:
"First of all, if you learn a simple trick, Scout, you'll get along a lot better with all kinds of folks. You never really understand a person until you consider things from his point of view."
Atticus presents this advice to Scout to reinforce the idea that unfounded judgments should not be strengthened among people. He claims that what we think about someone may be incorrect and we will only know this by getting to know the individuals and putting ourselves in their shoes.
This question is about the book "To Kill a Mockingbird" and you can learn more about it at the link:
https://brainly.com/question/11992798