• Higher Computing Science – https://sites.google.com/rgc.aberdeen.sch.uk/rgc-highercomputing/home
• Codecademy – https://www.codecademy.com/learn/learn-python
• Programiz – https://www.programiz.com/python-programming
• W3Schools HTML – https://www.w3schools.com/html/default.asp
• W3Schools CSS – https://www.w3schools.com/css/default.asp
• HTML Tutorials – http://html.net/tutorials/
• Mozilla – https://developer.mozilla.org/en-US/docs/Learn/HTML
• HTML Periodic Table – https://www.madebymike.com.au/demos/html5-periodic-table/
• Khan Academy (CSS/JS) – https://www.khanacademy.org/computing/computer-programming/html-css-js
• BBC Bitesize Higher – https://www.bbc.com/bitesize/subjects/zxmh34j

Thanks to Mr. M. Hay for collating these