There's a language that has citations built into statements of fact or belief; you modify statements based on how you came to know them. If someone asks, "Where is Alice?", your answer of "Alice is fishing" would be phrased differently depending on whether he told you he was going fishing, or whether Bob told you he saw her fishing, or whether you saw her fishing.

There's nothing like that online, so any given advice or answer in a comment could be coming from someone with 20 years of experience, or from someone who googled the exact thing you already did, and copied the first answer they saw on StackOverflow.