Useful Online Texts
There are lots of resources on the net for category theory.
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A good collection of Links on category theory.
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Tom Leinster’s excellent book is available free online.
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Some notes that might be useful. If you don’t read the notes, then a look at the references, which has pointers to a lot of good resources.
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Steve Awodoy’s category theory course’s lecture notes are essentially a PDF of his book. You should still buy the book. It is very good.
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Emily Riehl’s Book Category Theory in Context contains lots of examples of common constructions in category theory. Some of the examples might require some background in algebra. You can also buy the book quite cheaply from Dover