Once again, time and money are limited resources, that is why I recommend these books:
· "How to reassess your chess" 4th edition by Jeremy Silmanand/or
· "Simple Chess" by Michael Stean.
· "Silman's Endgame Course" contains everything you need for the rest of your chess career. I am not joking.
They are really WONDERFUL and HIGHLY instructive. Especially Silman's books have an excellent page per dollar ratio.