Following is link to same site, but with K-1 specified.
PENTAX DSLRs: Search results for K-1
---------- Post added 12-30-16 at 10:52 AM ----------
This is the link to the actual "ebooks4cameras" site where the ebook for the K-1 is offered. I actually find that the manual information (as has been mentioned) and use of the camera sometimes involving trial and error to be the most informative learning experience.
#ebooks4pentax
---------- Post added 12-30-16 at 10:59 AM ----------
As was mentioned earlier, Tony Northrup has some video tutorials available. The following is a link to a K-1 related tutorial which he created. I still would say for possibly more technical/in-depth information per the camera use that the manual and actual use are the best reference, but the tutorial may be of an aid in familiarization to some operations/techniques.
Pentax K-1 Overview Tutorial - Bing video