And how do you determine which websites are good other than checking if they are doing seo? Is reddit.com good or bad? If a good site that does seo should it be

And how do you determine which websites are good other than checking if they are doing seo? Is reddit.com good or bad? If a good site that does seo should it be taken out? And what if what you're searching exists only in a non good website? Isn't it better to show a result from a non good website than showing nothing?