You asked
Is the pentax k x good for beginners?
Here is what the site says about that.
From Pentax K-x: Pentax K-x: A DSLR by Pentax with a 12.4-megapixel APS-C sensor, announced in 2009. Runs on four AA batteries. Specs - Maker: Pentax - Mount: Pentax K - Sensor: APS-C, 23.5 x 15.6mm, crop factor 1.5 - Resolution: 12.4 megapixels - Stabilisation: in the body - Announced: 2009 - Type: DSLR Focal lengths on it Lenses frame like 1.5 times their focal length on full frame: 16mm like 24mm, 23mm like 35mm, ...
From Pentax K-1: Specs: - Maker: Pentax - Mount: Pentax K - Sensor: Full frame, 36 x 24mm, crop factor 1.0 - Resolution: 36.4 megapixels - Stabilisation: in the body - Announced: 2016 - Type: DSLR
Quoted from this site's pages.