Dashes, hypen and minus

links:

• https://jakubmarian.com/hyphen-minus-en-dash-and-em-dash-difference-and-usage-in-english/
• https://www.grammarly.com/blog/hyphens-and-dashes/
• https://practicaltypography.com/hyphens-and-dashes.html
• https://practicaltypography.com/math-symbols.html

- - hyphen-minus - used for compound terms and math as minus. What you get when hitting keyboard key.
- - hyphen - same as hypen-minus
− - real math minus (note that in programming it would often throw error if used)
– - en dash - used for span or range of numbers or scores
— - em dash - used as "soft comma" or instead of parens or for censoring words