Typical Expiration / Cache Directives for Websites

Expire static content a week or more into the future.

In .htaccess

# Turn on the module.
ExpiresActive on
# Set the default expiry times.
ExpiresDefault "now"
ExpiresByType image/jpg "access plus 1 month"
ExpiresByType image/svg+xml "access 1 month"
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType text/css "access plus 1 month"
ExpiresByType text/javascript "access plus 1 month"
ExpiresByType application/javascript "access plus 1 month"
ExpiresByType image/ico "access plus 1 month"
ExpiresByType text/html "access plus 600 seconds"

What about site updates?

Cache/Expiration based on full URL. So you can reflect the "version" within the URL, either as part of the path or part of the query string.