In this lesson I introduce you to a couple of helpful Trailhead modules. The first provides more details on Processes, Flows and Apex Triggers, as well as info on combining automation tools for provisioning solutions on the platform. I also suggest a module for beginning Apex Triggers.
Please note that you do not need to know how to code on the Advanced Admin exam, but strictly need to be able to identify scenarios that would require resorting to writing Apex and/or Visualforce code.
Choose the Right Automation Tool - https://trailhead.salesforce.com/content/learn/modules/business_process_automation/process_whichtool
Apex Triggers - https://trailhead.salesforce.com/content/learn/modules/apex_triggers
Nesting processes - https://help.salesforce.com/articleView?id=process_advanced_invocable.htm&type=5