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This forum is strictly for Salesforce issues and guidance.
Please don't post any kind of promotional here.
I hope you understand.
Regards,
Salesforce Support.
https://trailhead.salesforce.com/credentials/javascriptdeveloperi
These blogs will guide you further:
http://bobbuzzard.blogspot.com/2020/07/passing-javascript-developer-1.html
https://medium.com/trailhead/salesforce-javascript-developer-i-certification-decfc3b5f1aa