Dude this is about grammar not tech. They just gave you the physical description of what an em dash looks like and why it’s different to an en dash or a hyphen. As for the grammatical uses, hyphens are for like connected words like if you say half-sister. En dashes are technically for in between dates like July 19 – July 28. (People rarely use en dashes tho) Em dashes are similar to commas or parenthesis and have a wide variety of uses. For example you could say “I grabbed my AirPods—which had a cute Toothless case—and ran to the car, hoping I wouldn’t be late for school.”
Dude this is about grammar not tech. They just gave you the physical description of what an em dash looks like and why it’s different to an en dash or a hyphen. As for the grammatical uses, hyphens are for like connected words like if you say half-sister. En dashes are technically for in between dates like July 19 – July 28. (People rarely use en dashes tho) Em dashes are similar to commas or parenthesis and have a wide variety of uses. For example you could say “I grabbed my AirPods—which had a cute Toothless case—and ran to the car, hoping I wouldn’t be late for school.”