Start Developing iOS Apps (Swift)
Apple’s surprisingly accessible step-by-step guide to developing an app in Swift
Free videos to help you learn Vue 2
Great beginners (and beyond) tutorial for web development.
Breakdown of git workflows including feature branches
Learn iPhone and iPad Programming via Tutorials (Ray Wenderlich)
A short book getting you started on Rails. Includes use of git and deployment on Heroku.
Useful basics for database newbies, plus reminders for experienced developers
A List Apart tutorial aimed at designers and writers