Jquery is an upgraded version of Javascript where you can use readymade libraries and use Javascript code to implement bigger functionalities quickly without coding much. To learn Jquery, you need to be good at Javascript first. Here is a video showing how to use Jquery:
You can buy book to learn Jquery here: https://www.amazon.com/Learn-HTML-CSS-Javascript-Jquery-ebook/dp/B07Z68Z4RG/ref=sr_1_3?dchild=1&keywords=ziscom&qid=1621026361&sr=8-3
If you want to PDF version of book, you can get it here: https://ziscom.in/product/learn-html-css-javascript-and-jquery/
Contact for tasks in Jquery.