Explanation
Case escalation rules are a feature that can be used to meet this requirement. Case escalation rules can automatically escalate cases that meet certain criteria, such as being open for more than a specified time or having a certain priority. Escalation rules can assign cases to a different owner or queue and send email notifications to the support manager or other recipients. References:
https://help.salesforce.com/s/articleView?id=sf.case_escalation.htm&type=5

Explanation
Validation rule is a tool that can be used to enforce data quality and business logic by preventing users from saving records that do not meet certain criteria. In this case, a validation rule can be created on the Opportunity object to display an error message if the Stage field is Closed lost and the Loss Reason field is blank.
References: https://help.salesforce.com/s/articleView?id=sf.fields_about_validation_rules.htm&type=5

Explanation
Security Health Check is a tool that can be used to identify and fix potential session vulnerabilities. Security Health Check scans the security settings in an org and compares them to a baseline set ofstandards, such as the Salesforce Baseline Standard or the Salesforce Optimized Standard. Security Health Check provides a health check score and a list of issues and recommendations for improving the security settings.
References:https://help.salesforce.com/s/articleView?id=sf.security_health_check.htm&type=5