Its for Automation selenium engineer. In your videos, only Javascript executor has been discussed.
Take the following job profile as an example,
https://www.naukri.com/job-listings-Hiring-Selenium-Test-Manager-12-16-Years-Pune-Location-Capgemini-India-Pvt-Ltd-Pune-12-to-16-years-011016002360?src=jobsearchDesk&sid=14768704808458&xp=1&qp=selenium%20capgemini&srcPage=s
Here, its written as 'good javascript knowledge' .
So, I am not sure how much javascript knowledge one should have and why this is required in automation other than things like javascript alerts and javascript executor?