Tutorial sites
You can learn more about WordPress by visiting the online manual for WordPress, WordPress Codex, a living repository for WordPress information and documentation. Belows are some helpful tutorials:
https://www.000webhost.com/wordpress-tutorial#creating-page-on-wordpress
https://websitesetup.org/customize-wordpress-101/
Guidelines
Belows are some guidelines from ITS or CPAO:
https://its.hku.hk/about/policies
https://its.hku.hk/itsform/forms/CF-106i.pdf
https://www.hku.hk/reserved4/policies-guidelines/index.html
https://www.hku.hk/about/policies_reports/privacy_policy.html
https://www.hku.hk/web-accessibility/
Useful Tools:
Website speed test tool: https://gtmetrix.com/
Google page speed test: https://developers.google.com/speed/pagespeed/insights/
Google SEO gulidline: https://support.google.com/webmasters/answer/7451184