Often, in text on the net and in print and other media, I see multiple full-stops instead of an ellipsis, or hyphens instead of an en dash or the longer, em dash.

And I wonder, if it were known how to press the right keys on a keyboard, would they be written properly.
Here is a list of how to press the right keys...
Keystrokes
 Apple keyboard Windows keyboard
Ellipsis (...)
 Option+Semi-colon (;) Alt+Cntrl+Fullstop (.)
En dash Option+Hyphen (-) Cntrl+Minus-Sign (-)
Em dash (longer) Option+Shift+Hyphen (-) Alt+Cntrl+Minus-Sign (-)
Copyright (©) Option+g Alt+Cntrl+C
Registered (®) Option+r Alt+Cntrl+R
Single Opening Quotation Mark (‘) Option+Right-hand
square bracket (])		 Cntrl+`(single
quotation mark),
`(single quotation mark)
Single Closing Quotation Mark (’) Option+Shift+Right-hand
square bracket (])		 Cntrl+`(single
quotation mark),
`(single quotation mark)
Double Opening Quotation Mark (“) Option+Left-hand
square bracket ([)		 Cntrl+`(single
quotation mark), Shift+` (single quotation mark)
Double Closiing Quotation Mark (”) Option+Shift+Left-hand
square bracket ([)		 Cntrl+`(single
quotation mark), Shift+` (single quotation mark)
Find out more of the right keys at... Microsoft Office online or...
download Mac Keyboard Special Characters. They'll help enormously.