If I were going to recommend one book it would be
'the one straw revolution'. Funny really, because I avoided reading it for years but that book really helped me with observation and 'doing nothing'. I guess it is a bit like the difference between efficiency and effectiveness. Gardening books in general will tell you
how to do things, but the one straw revolution will help you know
what to do (or
not do).
Books can only take you so far with learning though, which is where SKIP comes in
What I like about permaculture (and permies in particular) is that it can cover all areas of life, from relationships to making the bed, as well as growing food and reducing waste.