Ask HN: I have info and loads of manuals in Emacs, how do I use them?

Emacs famously has so many features and most mature packages you find have decent documentation, yet whenever I need to look for a new package or information on say org-mode, I find myself just googling it because C-h a (which I default go to) doesn't whittle things fast enough.

How can I use emacs info and friends more effectively? Specifically in looking up docs on already installed packages? Asking here because this might end up being useful to others.