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cocoacocoa 

In realtime Is that mandatory to have knowledge on Jquery and Ajax? How often we use these concepts? Thanks in advance.

Rahul KumarRahul Kumar (Salesforce Developers) 
Hi CoCo,

IT totally depends upon the requirement (user story)we will be using.May I suggest you please refer the below link for reference on Ajax. Hope it will be helpful.

Please mark it as best answer if the information is informative.

Thanks
Rahul Kumar