Which book is a standard for introduction to genetic algorithms?
Most of the "standard textbooks" (e.g., Goldberg, Mitchell, etc.) are pretty dated now. If you just want to have some confidence that you understand how the basic algorithms work, they're fine, but they tend to emphasize material that's doesn't necessarily match the more modern way of understanding and talking about things like theoretical issues.

I've used the Eiben and Smith (https://www.amazon.com/Introduction-Evolutionary-Computing-Natural/dp/3642072852) book to teach evolutionary algorithms to my students over the past few years. It's a bit more concise than some of the others, but if you're OK with that, I think it does a better job of covering the stuff that's relevant about evolutionary computation today.