Hey Sagar Kapoor
You can start your learning from tableau Training and Tutorials link .http://www.tableausoftware.com/learn/training
Along with that start reading administration guide of tableau http://downloads.tableausoftware.com/quickstart/server-guides/en-us/server_admin82.pdf
I think this is the best way to start tableau server learning,also follow this community for troubleshooting tips and solution of various issues which we server admins are facing and solving them by helping each other.
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Welcome to Tableau! Our resources page might also be a great place to start:
I compiled common resources that I believe are beneficial to new users and hopefully they can help you to answer some of your own questions.
Good luck and feel free to reach out if you have any questions!