I tried to read through the PMBOOK but  feel too dull and too many things so I decided to stop half way.

Then I went through the Kim Heldman book. This book let me have a grasp on main process group. Anyway, I still feel there is something missing and not complete.

(Well, I went for my 1st PMP exam atempt and failed miserably).

So I went for RITA PMP EXAM PREP, it focus on knowledge area. After finish this, now I have overall understanding of all the 5 processes and knowledge areas.