Rhetoric is: "the ability, in each particular case, to see the available means of persuasion." He described three main forms of rhetoric: Ethos, Logos, and Pathos. In order to be a more effective writer and speaker, you must understand these three terms.
Even tho you didn't post the example I think it's this ^ because I've helped my brother with something similar like this but if it isn't just tell me and I'll be willing to help you if you need it.
Don’t take advantage of others, listen to people with an open mind, think about your your actions will affect others, don’t blame other for your mistake, and tell the truth.