>>14732858
It depends, do you intend to got further in math? Then you really should work your way through difficult books like Amann, Escher; Rudin; Zorich.
However, if you don’t care about that, you could just go for Abbott. Though I warn, you really should use easy books like these only if you’re in some sort of time constraints. You lose a lot of opportunity for mathematical maturity, when you read these books which hold your hand throughout.