The California Office of the Attorney General lists federal and state agency contacts, arranged by topic, in the Complaint Referral Table.
California Department of Consumer Affairs offers this topical index of Significant State and Federal Consumer Laws (2012) with links to California statutory provisions and California and federal regulations.
California Consumer Laws (articles and related pieces; updating varies) on a variety of topics are available from FindLaw site.
USA.gov's State Consumer Protection Offices finder links you to the main consumer affairs/consumer protection agencies for all states.
FindLaw offers more articles on Consumer Protection from a multi-state and federal perspective, with links to comparative and state-specific materials on some topics (updating varies).
The CPPA shares with the OAG (below) responsibility for investigation and enforcement actions for most violations (other than data breach) of the California Consumer Privacy Act:
In addition to CCPA enforcement, the OAG provides some general consumer protection enforcement. For businesses and industries not covered by a responsible state agency, the California OAG collects consumer complaint information to determine if investigation or action is needed.