I'd just forget learning servicenow scripting specifically and learn javascript instead.

If you just try to learn servicenow scripting first, then you're going to lack the fundamentals required to actually understand what or why you're doing something.

For example on udemy Zero to Mastery had a great course that goes through basics and some advanced concepts of javascript and react. If you go through that you'll pretty much have all the info you need to get started with servicenow.
Of course Servicenow has some custom functions and scripts that you need to understand, but those come quite naturally when you actually understand javascript.

For example servicenow has Script Includes which are pretty similar to classes. You can extend them and they can include multiple functions that you can call from elsewhere. If you learn how javascript classes and functions work you're good to go with servicenow script includes as well.

Hi @RameshreddyE ,

You can check my my scripting series video. I have explained it right from scratch with real world scenarios.

https://www.youtube.com/watch?v=wM4jl2NFm6M&list=PLVuhoY6Ddi5gKN24uvZglHsnooR8xMxYE&ab_channel=Servi...

You can find related documents at https://servicenowwithrunjay.com/ 

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Runjay Patel - ServiceNow Solution Architect
YouTube: https://www.youtube.com/@RunjayP
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Hi @RameshreddyE 

You can follow my playlist as well on ServiceNow Scripting:

https://www.youtube.com/playlist?list=PLi0Ik1xCDEbK5BJme5YSGZASvl0nkaFHn

Hi,

There are several YouTube channels available to learn ServiceNow scripting. However, the best channel for mastering scripting from the basics to advanced scenarios are;

1) TechWithPri : ServiceNow Developer Playlist

2)  Learn ServiceNow with Ravi:  ServiceNow Development Scripting playlist and ServiceNow Real Time Scenario-Based Interview Questions Playlist.