You can also learn touch typing, that'll save a lot of time

Software Engineer

SQL. It's fun and quite useful 
  
 (ps: I like the codesignal SQL challenges, pretty fun solutions you'll find for the problems)

I want to upscale myself and i have around 4 hours of free time daily. 

What are some tech skills that you can learn within 20 hours, easily and quickly.

I'll

I want to upscale myself and i have around 4 hours of free time daily. 

What are some tech skills that you can learn within 20 hours, easily and quickly.

I'll start - 
1. Powerbi
2. Tableau,
3. Alteryx
4. Excel
5. Ansible
6. Jenkins

What else?

What are some quick and easy skills you can learn within a week