free useful skills videos courses & tutorials
website
video courses
https://www.educative.io/explore/free
https://www.appbrewery.co/courses
docs tutorials
https://www.freecodecamp.org/learn
https://www.sololearn.com/Courses/
https://refactoringguru.cn/design-patterns
https://developers.google.com/web/fundamentals/
https://developers.google.com/training
zh-Hans tutorials
https://developer.mozilla.org/en-US/docs/Web/
refs
MOOC
https://www.youtube.com/playlist?list=PLpc_YvcwbxaRl8WOTamrAD78jnsuNqM1C
https://www.youtube.com/watch?v=L07i4g-zhDA
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