I have found that being wise is different from knowing stuff. There are people who stockpile knowledge and use it to elevate their self-esteem. People have studied subjects for years and have cultivated and curated knowledge through hard work and dedication. Whereas some folks like to show off what they think they know just because they read it in one book or on a website. Sounds familiar and personal right?
Personally, I am not a fan of people who think they know everything about something just to show off. Listening to a learned teacher who can impart knowledge is always preferable because they have not only read they have sorted things out through some deep reflection and contemplation.
To the old, try not to know better because of your age and life experience. To the young just chill out and be sure you know of what you speak about.
In short share what you know and admit when you don’t know jack. Be humble and willing to learn new things, just saying.