VBA, Python, Forecasting, ML, SQL, R. Some C#, Java, JavaScript, HTML/CSS.

Links I refer to:

1. How to use browser Find box to apply css selectors and find strings in html 1 , 2
2. CSS selectors
3. Practice css selectors
4. querySelector, querySelectorAll, other
5. Find xhr requests feeding dynamic content 1, 2, 3, 4
6. HTTP methods
7. CSS :nth-tester
8. CSS selectors level 3
9. CSS Sandbox
10. Browser css test suite
11. nth-child
12. Selenium methods - benchmarking
13. CSS v XPath benchmarking
14. js re-arranging elements
15. :not to filter lists
16. Beginner HTML5
17. js source files
18. HTMLFile Native methods
19. Threads|multi-processing

Useful:

1. Understanding Stack Exchange Data Explorer Schema
2. Jon Skeet's checklist for writing a good question
3. Pages for scraping 1, 2
4. Effort expected of questions