Speaking of avoiding plagiarism and attributing where you get information from, have you ever thought about how this practice happens every day around you? It does!
In real life, you're not going to include a formal citation in an email to your cousin. However, you might link to a news article backing up a claim you make in that email. We call these informal citations, or "blog style" citations.
Really, something as simple as a link to an article in an email is an informal citation.
Informal citations allow everyone to cite their sources in less formal forms of writing, like blog posts, emails, news articles, and webpages. Informal citations are how everyday creators of information acknowledge ownership, attribute quotes, check facts, and learn more. The beauty of informal citations is that they force you to think about how your sources fit, and actually say why you're sharing them. (Those are skills that you also need in order to write more formal research papers!!)