I am receiving the following notification
Security & setup warnings
php does not seem to be setup properly to query system environment variables. The test with getenv("PATH") only returns an empty response. Please check the installation documentation ↗ for php configuration notes and the php configuration of your server, especially when using php-fpm. The "Strict-Transport-Security" HTTP header is not configured to at least "15552000" seconds. For enhanced security we recommend enabling HSTS as described in our security tips. No memory cache has been configured. To enhance your performance please configure a memcache if available. Further information can be found in our documentation. Please double check the installation guides ↗, and check for any errors or warnings in the log.
None of the links seem to work to doc.owncloud.org
Can anyone tell me how I can fix these?