Basic monitoring tools should be a vital part of your administration skills. From login history to setup changes, you are now able to investigate who did what on your organization (including delegated administrators).
When a bug occurs, you will even be capable of debugging a record transaction using the debug logs. With the Health Check, you can put down your sheriff's star and put on your medical gown to make the medical diagnosis of your organization.
Now that we have a safe organization, we can talk about how metadata change management is handled in Salesforce and what testing organizations we can use to test out our new implementation.
In the next chapter we will learn about about the different Salesforce organization types (such as sandboxes, developer organizations, and production organizations).