I would like to learn about kernel space, user space and system calls. Is there any book or well written resource that i could refer to?

Any suggestions?

Running a search in any search engine will get you a lot of hits.

General overview here is pretty fair;
http://linuxnewbieguide.org/?page_id=5

Just click on the chapter heading to go to the chapter.

I will throw these out there in no particular order;
http://www.tuxradar.com/content/how-...ultimate-guide

http://www.freeos.com/articles/3102/

http://www.cyberciti.biz/tips/unders...em-part-i.html

Should clear the air a bit for you.

You should check with the documentation on your distros website or the website of the distro it is based on. They usually have some good information.

If you use Debian or some offshoot thereof;
https://debian-handbook.info/

would be good. It is downloadable from the Debian repo if you use Debian itself.

And: "Use the Source, Luke!"

You can install "kernel-source" packages on your computer and browse the actual implementation of everything at your leisure.

Be aware that Linux runs on more than twenty hardware platforms ("/arch-itectures ..."), and that over time it has evolved in many different ways and continues to do so. Some implementation details are very specific to the particular kernel version that you are using, and, to a lesser extent, the hardware capabilities of your particular system's microprocessor and motherboard. On the system-software side, a great deal depends on whether or not your system uses the systemd system-management process. And so on and on and on.

Check the publishing-date and applicable kernel-version of any resource that you use.

Thanks alot for the links and the comments. Im reviewing right now