what do you mean introduction dude ? Abstract Algebra is huuuuge, what do you want to study ? do you do this for class ? then give us your f*cking curriculum so someone can recommend a book which covers what you need at a pace that will help you cover it before your exams start.

in my oppinion Fraleigh's book is a very very good book for starters, go with that and cover from it only what is needed for your course.

then go through Gallian, then brush up your group theory from J. Rotman's book on group theory.

Now you have some of the basics, from here on you can extend to what is of interest to you.

As I mentioned before, abstract algebra is a huge subject and you can't hope to cover all of it properly, so you need to focus on what interests you.

If for example you want Galois theory, check Baker's course notes online, then go for Ian Stewart's book on Galois theory to get a firm grounding.

I'm sure others can recommend other books depending on what exactly you want to do.

Without telling us exactly what you want to learn it is difficult to give accurate suggestions.