And also it needs high spec system for that to work properly,even I installed it initially but not aware of that it will take forever to sync on my laptop then I decided to move to electrum which is pretty simple for the normal users like me.
Wrong, Bitcoin Core isn't that heavy, you can run it on Raspberry Pi 2B which costs $25 and use only 5W. If you bother tweak it's configuration, you can run it on Raspberry Pi 0 which costs $5.
What Bitcoin Core actually need is
user's patience fast connection for initial sync.
Very useful links... Can you provide me pdf of mastering Bitcoin book? don't know how to read on GitHub website..
You just need to select file with filename
chxx.asciidoc on GitHub page to read it online, that's all.