What does the following line of code do? jQuery('p')

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?

Which function is used to make a copy of a selected element?

How do you test if an element has a specific class?

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?