English
Grammar: Practical English Usage
Writing: Chicago Citation Style
Maths
- NLCS Maths Department
- CIMT UK’s Math Enhance Programme
- Mathigon – visualization & games
- Euclidea.xyz geo games
- 口算：视频介绍 | 练习建议(繁体) | 企鹅速算 🍏 (小猿口算)
- A Maths Dictionary for Kids (Flash based with PDF) by an AU teacher
Computer & Technology
- Missing Semester of Your CS Edu – MIT: shell, vim, git, debug, etc. | CMU GPI
- CS50 | Cloud9 IDE
- Typing: Typing Club | BBC Dance Mat Typing
- Internet safety: modify hosts to block ads & adult-only sites on your desktops| use CleanBrowsing DNS servers on your routers
- Hardware: ADS-B Decoder | AIS Receiver