Generally speaking, when used on a web page, how should jQuery be installed, and why?

What is the difference between $('header').html() and $('header').text()?

When writing jQuery plugins, we often provide default options that may be overridden by the end user. What jQuery function is most useful for this purpose?

You want to work with AJAX using a Promise-like interface instead of nested callback functions. What jQuery API should you use?

What is tricky about jQuery's nth- filters (:nth-child, :nth-of-type, etc.) relative to other filters?

Effects like show, hide, fadIn, and fadeOut can be called with no arguments, but can also take arguments for how long they should last. Which is NOT a duration argument supported by these functions?

What is the proper way to show an element?

Which function does jQuery provide to remove whitespace from the beginning and end of a string?

Which is a syntactically valid jQuery command?

Illustrate selecting a HTML element using its class:

Which is valid?