Question: How do you potty train a kid?

Actually, potty training a kid is a lot like training a dog to go outside.  See this link for more information.

Well, ok, it's not identical.  That bit about keeping your dog in a tiny crate, if you try to do that with your baby, be sure not to let your neighbors see.   Aside from that, it really is about training, praise, and timing.

One note on the praise, keep the rewards pretty small.  You don't want to be handing out trips to Disneyland each time your kid squeezes out a tiny squirt of piss.  I think we used some sort of candy as a reward at first, but it was a pretty small amount like one jellybelly.  We transitioned to a model where our daughter had to go several days without an accident to earn a present or frequent flyer miles or something like that.  It's all a bit fuzzy at this point, but our daughter hasn't pooped on the carpet in a lot of years, so I think it all worked out pretty well.