jQuery is an all-purpose library that makes several vanilla JS tasks easier, notably for manipulating the DOM. It's not strictly necessary knowledge these days, but it is still good to touch on as you learn about the frontend portion of web development. Don't spend too long getting all the details, but I would recommend looking at it - if only to contrast it with more modern methods of frontend development.
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jQuery is an all-purpose library that makes several vanilla JS tasks easier, notably for manipulating the DOM. It's not strictly necessary knowledge these days, but it is still good to touch on as you learn about the frontend portion of web development. Don't spend too long getting all the details, but I would recommend looking at it - if only to contrast it with more modern methods of frontend development.