ahoy @manas169014,

could you share what materials were not clear for you? To have an idea about what to suggest to make it easier for you..

Maybe what you can try is career journeys and paths, tailored by ServiceNow for this purpose:

 ServiceNow Career Journeys & ServiceNow Career Paths 

• Pick a ServiceNow Career Path that matches your interests.
• We’ll help you start at the right level based on your skills.
• A ServiceNow Credential gives you industry recognition.
• It proves your investment and boosts your professional value.

Let me know if you want to discuss it in more details