I understood it as to recognise when it’s words are only packaged as “advice” from their bad experience (eg something general, vague, without specific logic you can take & apply to other situations, like “never get married”, “never invest”, “never build your own house”, etc).

That is not the same as a fully argumented logic (which the person might indeed have learned from their own mistake), like “if she explicitly promised that in the first week of marriage she will steal you money, murder your neighbors & pin it on you, and you would not want that, don’t marry her”.

Basically if someone opens a muffin shop & it goes out of business, and you are thinking of opening a muffin shop (“Muffin tops for muffin bottoms”), you are gonna need to know why it went out of business, not just that it went out of business, it’s a huge difference.
(It was in a neighborhood filled with lean tops. So tweaking the business model only a little but meant huge success.)

Yep. In my experience the real trick is to find the value in advice, regardless of who/what/why (as I give this advice haha). For example, we’re trained to call out hypocrites but really, hypocrisy shouldn’t be immediately discounted just because it’s hypocrisy. A drug addict can absolutely tell someone they shouldn’t do drugs. Hypocritical? Yep. Good advice from someone who really knows? Also yep.

Critical thinking is the single most important skill a human can learn.