How much Javascript do I need to know for SEO? earn by blogging adsense income

Just wondering...how much Javascript knowledge is needed for SEO? I am learning Javascript right now actually, such as constructing loops, arrays, and all that basic stuff...but do I really need to get too in-depth? What exact relevance does the language have with SEO? Just not exactly sure how much Javascript knowledge is needed. People always say oh you should have basic knowledge in javascript for SEO. So how much do I need to know exactly? More than HTML & CSS? Thanks...

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