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Check out a free preview of the full Introduction to JavaScript and jQuery course:
The "Core Concepts of jQuery" Lesson is part of the full, Introduction to JavaScript and jQuery course featured in this preview video. Here's what you'd learn in this lesson:

Find something, do something Why jQuery uses the $ character as its main function. Overview of the $() Function, passing a selector string into this main function creates an “array-like” collection of elements. What you can do with jQuery and what it does best.

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