I hear from a lot of non-quiz enthusiasts who want to enhance their general knowledge for social and conversational settings.
My most important tip for anyone like this is: MAINTAIN CREDIBILITY.
If you want to be respected for being a knowledgeable so-and-so among your friends, don't ever express a trivia fact you don't know to be 100% correct!
An important skill of any quiz-player is the ability to 'guess' the correct answer. Not in a mindless, non-thinking sense, of course. But in a educated, considered manner, using pre-existing knowledge to churn up the correct answer.
In the context of a pub or other type of quiz, this kind of guessing is totally acceptable.
In a social setting, it can end up demeaning your clever-kudos!
Afterall, no-one likes a know-it-all... especially a wrong know-it-all!