What HTTP header RESPONSES should I be explicitly setting when I output a webpage?

[Occalcumn]

So I just now learned of the X-Robots-Tag which can be set as part of a server response header. Now that I have learned about this particular field, I am wondering if there are any other specific fields I should be setting when I output a webpage via PHP? I did see this list of responses, but what should I be manually setting? What do you like to set manually?Restated, in addition to...\[code\]header('X-Robots-Tag: noindex, nofollow, noarchive, nosnippet', true);\[/code\]...what else should I be setting?Thanks in advance!