Of is a preposition. It can have a lot of different usages in the English language. Let's have a look.
It means to belong to or relate someone or something.
'Of' is also used to show amount.
'Of' is used to show number, age or date.
'Of' can mean contain or consist of.
'Of' can be used to show a reason.
'Of' can mean about.
Usage of 'of' to show someone or something.
'Of' is used to show a characteristic.
'Of' can mean 'to live or come from a certain place.
Off is an adverb. It can be used in a few scenarios such as:
'Off' can mean not touching something or removing something.
'Off' means canceled.
'Off' can mean something that is not operating or not at work.
'Off' can mean that someone is away from a place.
'Off' can mean near.
'Off' can mean far away as well.
'Off' can mean discount.
'Off' means leave too.
The best way to remember the difference between of and off is that, Of means connected and off means disconnected.
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