What are the some best websites for mechanical engineering to get basic stuff and preparing for gate
The one and only best website for gate and psu exam for mechanical engineering is the NEPTEL

Hello Dileep,
I am sharing some good resource material with you.
http://gateacenotes.blogspot.com/2016/04/ace-academy-notes.html
http://gateacenotes.blogspot.com/2016/10/gate-mechanical-ace-academy-notes.html
http://gateacenotes.blogspot.com/2017/03/gate-cs-it-ace-academy-handwritten-notes-study-material-pdf.html
http://gateacenotes.blogspot.com/2017/03/gate-previous-year-question-papers-for-electronics-communication-ece.html
http://gateacenotes.blogspot.com/2017/03/prepare-gate-exam-in-one-month.html
These would definitely help you out.
Just go through it.
Regards
Tanushree Seth