Well, you could start by:

- actually doing some homework - like perusing the information at https://kernelnewbies.org/

- putting a subject line in your email

Just saying.

Where to get started?? I am interested in understanding how the kernel works but have no prior knowledge... Please help!!

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-- 
In theory, there is no difference between theory and practice.
In practice, there is.  .... Yogi Berra

Theory is when you know everything but nothing works. 
Practice is when everything works but no one knows why. 
In our lab, theory and practice are combined: 
nothing works and no one knows why.  ... unknown