w3 Schools

http://www.w3schools.com/

thenewboston

https://www.youtube.com/user/thenewboston

DevTips/Travis Neilson

https://www.youtube.com/user/DevTipsForDesigners

Stack Exchange/Stack Overflow

https://stackoverflow.com

A list of questions/answers which helped me.

All fonts are licensed under the SIL Open Font License

DM Mono by Colophon Foundry

https://fonts.google.com/specimen/DM+Mono

Indie Flower by Kimberly Geswein

https://fonts.google.com/specimen/Indie+Flower

Raleway by Matt McInerney, Pablo Impallari, Rodrigo Fuenzalida and Igino Marini

https://fonts.google.com/specimen/Raleway

Roboto by Christian Robertson

https://fonts.google.com/specimen/Roboto

Octicons v14.2.2 by GitHub

https://primer.style/octicons/ - Licensed under the MIT License

Bootstrap Icons v1.5.0

https://icons.getbootstrap.com/ - Licensed under the MIT License