Final answer:
The best indicator of the currency of a web page's content is the date listed after "Last updated on...". It is important to also check for current and functional links on the page.
Step-by-step explanation:
The best indicator of the currency of a web page's content is the date listed after "Last updated on...". This date provides information on when the page was last modified or edited, ensuring that the content is recent and up to date. Additionally, it is important to check for current and functional links on the page, as broken or outdated links may indicate that the page's content is not current.