For Drupal Commerce 1.x on over to DrupalCommerce.org.
On the site you will find a nice overview of the original 1.x build and links to all the relevant user guides. Linked below for your convenience as well.
- User Guide - A site builder guide with lots of screenshots that
covers installation, order management, product creation, and a myriad
of other topics.
- Developer Guide - A guide built for developers that outlines
architecture, building payment gateways, code workflow, and utilizing
- Commerce Kickstart 2 - A guide built for site builders that are
demo’ing with Kickstart 2.x
- Commerce Cookbook - A cookbook of common site builder tasks that
covers things like shipping, inventory, reporting, merchandising,
- API Documentation - The doxygen output of all the code
documentation that ships with all Commerce installations.