Courses:
https://www.edx.org/course/cs50s-introduction-to-computer-science
https://www.edx.org/course/introduction-to-computer-science-and-programming-7
Practice:
https://www.hackerrank.com/
https://projecteuler.net/
https://www.codingame.com/
Tools:
Intro to git
Intro to Visual Studio Code
The repository of programming knowledge