Hi hello i need to learn jenkins
That’s pretty vague. I would suggest going through the documentation and asking follow up questions if you have any afterwards: Jenkins Handbook
Hello @lokanadhareddy and welcome to this community 
The place to go is definitely Jenkins User Documentation .
You will find descriptions of the concepts behind jenkins, tutorials on how to get started, and so on.
There is also a gitter channel for newcomers: https://app.gitter.im/#/room/#jenkinsci_newcomer-contributors:gitter.im .
You could also have a look at @darinpope playlist named “Jenkins Tutorials”: How To Change Jenkins Port - YouTube
Enjoy your stay. 
Also, don’t forget the very thorough Jenkins Tutorial by Saeid Bostandoust.
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