rooting Android on a Mac

[Asdrual]

I'm very new to the android ecosystem. And I am very overwhelmed by his entire rooting thing and all. And have some questions

Do I I have to root my phone if I want to install cracked apps???

I know that is If I root my device a void the warranty but how can un do the root and get back to factory settings without any body knowing I rooted my phone. So let's say I can take it in and get it serviced ????

Finally this whole root thing is so confusing that I was wandering if there is program for mac that you just plug in your phone and the with one click and root your device . Much like redsn0w or limera1n for iPhone