Dear Rajat

Good question. i think many people joining PMZilla may not be aware of the notes and various free stuff available to PMP Aspirants.

Check this link http://pmzilla.com/pmp-study-material-pmp , here we have collected some top and best PMP materials required by PMP aspirants

http://pmzilla.com/comprehensive-pmp-notes this link has the best collection of PMP notes, Since it is available for FREE, people dont care about the value it has. Even though some of the notes may be from previous PMP versions it still has relevancy and great tool for clearing concepts. 

Also check out the sub links

• Raga's 355 points
• Manoj's ITTO Remembering Tool
• Rofa PMP Notes 4th edition

PMZilla has a forum for Lessons learnt and experience sharing. While you should read the current post, there is a collection of Good LL too

• PMZilla - Collection of Key lessons learnt

All this is available on the master link mentioned at the start of the post. 

I would suggest do update this post with what you found most useful, so that others can also benefit.