Ich isn't that common as you think. As Mikey says, if you are careful, you may never deal with it.
I for one have only seen it in other peoples's tanks and even once in the LFS, but haven't dealt with it myself.
And even if you have to deal with it one day, it's easy to diagnose and there is vast information how to treat it.
The dangerous part is, when your fish get something else different than ich, impossible to figure out sometimes and can take months to eradicate. The key to all is stress, bad water conditions, failure to quarantine, etc..etc..
So stick to proper care and maintenance, and learn about that instead. Prevention is the best cure.