I want to learn photography. Is Pentax kR( 18-55) enough? OK or not? What are the pros and cons? Please elaborate ~ Thank you, Daxian.

That's enough. The disadvantage is that Pentax does not have a full body, and there is not much room for lens selection. Good lenses are expensive, and because few people use them, Chinese mainland's after-sales outlets are only available in Beijing and Shanghai. There are problems in other places, which must be repaired by mail. If you don't consider upgrading in the future, kr is a good choice with high cost performance.