I have started using it to debug my errors, which I usually used to Google otherwise, and take my words once you start using it , there is no going back.
Best part is along with answer , it also provide references from where it took that, so I can make sure that answer is correct and probably can found more on the reference link page.
It has literally increased my efficiency, now I don't have to read multiple documentation or stack overflow pages. Just one avjo ask is enough for me.
