@Ani12 @Aniruddha
It does not take much time to perform App registration but before we do it, we need to understand the requirement of the application. Also, normal user can not perform App registration. The user must have elevated permissions or global admin can perform the steps.
I generally try App registration in my personal tenant first and will contact the Global admin to perform same actions for me.
Here is the easy explanation of App registration:
https://www.youtube.com/watch?v=93j0MmRruFo
Important Note: During App registration, you will have a App Client Secret. Make sure it is not shared or accessible to other users. Using this App Client Secret, they can perform all the actions your App can perform. Generally, I store it in Azure Valut and in the Power Automate actions, I set Secure settings from displaying in the flow execution results.

Please let me know if you have any more questions.
Regards
Krishna Rachakonda
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