Laravel, Filter. Jscript,Jquery. I need your help guys?

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I have categoris of courses as in the picture. When i choose one of categories, second drop down List of Courses must show me only the courses which are attached to that very course_category. Untill then it must be empty(not empty but it must not show me all courses, as now). But now it shows all the lessons whether i choose lesson_category or not. So how to do this guys. Please help. thanks in advance.

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