yes
I think it would be preferable in most cases to write 1880's. I would not spell it out.
No there is no hypen in the word nonjudgemental.
Nothing will happen if you put an hypen, or "-" sing before a word. If you are typing a word and you run out of room, then you would put a - before the page breaks. Also, you could use a hypen between a phrase such as "point-of-view." There are many ways to use a hypen, but using one before a word, I'm not quite sure.
No
yes
The symbol for a hyphen is "-".
no
No.
No hypen is necessary.
No, the word "preplan" does not require a hyphen. It is a compound word that combines "pre" and "plan" without any punctuation between them.
visit
No, "sign off" is typically written as two separate words with no hyphen. It is used in informal and formal communication to indicate the end of a message or communication.