some useful websites/courses for study, all free here

• Beauty of Data Visualization - in Chinese, Visual ML Series 2

• Elements of Mathematics - in Chinese, Visual ML Series 3

• Interactive Linear Algebra

• Power of Matrix - in Chinese, Visual ML Series 4

• Essentials of Posibility and Statistics- in Chinese, Visual ML Series 5
• Gaussian Process Visualization - Hyperparamters Effect

• Developer Roadmap

• 黑马程序员教程
• 菜鸟编程
• Emoji Cheat Sheet

• The_C_Programming_Language_(2nd_Edition_Ritchie_Kernighan)

• Python For Beginners - in Chinese, Visual ML Series 1

• FreeRTOS 从入门到精通

• Linux 就该这么学 第2版

• 鸟哥的 Linux 私房菜

• Keil 系列教程

• 黑马程序员
• GeeksforGeeks

• Node-Express-Course link:github

• Arduino Cookbook, 3rd Edition | Associated Code

• Hardware Families
• IDE
• Arduino Cloud / IOT Cloud
• Tutorials
• DOCs

• 物联网开发实战

• First Course in Data Science - in Chinese, Visual ML Series 6

• Visualization for Machine Learning - in Chinese, Visual ML Series 7

• Hello Algorithm - in Chinese

• Dive Into Deep Learning (En) | Dive Into Deep Learning (CN)

• Pytorch

• Tensorflow