Best practice in typography

I looked at the best practice in typography according to Tom Koszyk, the writer on this page that our teacher gave us to summarize the points. https://medium.com/product-design-ux-ui/26-digital-typography-rules-for-beginners-a04c6a5aaff3

1.  Avoid using typeface that's fancy
2. Try using a typeface like Trajan Pro for head titles rather than the body of a text. 
3. Avoid the typeface, Throw Comic Sans at all costs
4. Default typefaces like Times New Roman are great and better than using a typeface that is unreadable.
5. Use no more than two fonts as it will give you the best outcome.
6. If you're going to mix typefaces, use ones that are different from each other rather than similar to each other.
7. Try to make the text as readable as possible by making the x-height similar to the other typeface when mixing. 
8. When writing on a web page, 13 px. and 14-18 px. is the preferable size of the text and easiest to read. 
9. Size 9 - 12  pt. is best for print text.
10. The best line length for paragraphs is 45 - 75 characters and 66 characters in a line is most preferable. 
11. Use the right leading, by setting a line-height at 125% of the size of the text. 
12. Use ragged right/flush left for paragraphs for almost all of your writing.
13. Use Hyphenation as little as possible.