Your system contains a few dozen standard Application Specifications that cover common functional capabilities such as adding a work item to a cover, attaching a note, and so on.
These specifications are available for use in any application. You can reference the standard rules in your application's flows and application rules, or copy them into your application RuleSet and modify them as needed.
Use the Records Explorer to see a complete list of the standard and custom rules available to you (based on your RuleSets and security).