A lot of content on StackOverflow is trivially verifiable - just put it in your IDE and see if it runs. You'll notice that the more subjective questions on StackOverflow almost always 1) get closed immediately or 2) are filled with bad answers.

(You'd think getting a refund is trivially verifiable, too, but who's going to go to all that work?)

StackExchange is a like a highly moderated subreddit mixed with a Wiki. Mods ensure the posts are of minimum quality, require sources for novel claims, and remove disinformation. An SE community also tends to strongly embrace the general rules for SE, which keeps it from being overrun with "reposts" and "clickbait".

> just use jquery

Not that well.