There seems to be many different ways of saying either to agree or to disagree with a person.
Which words are there, in what circumstances should they be used, and are there any relevant examples of their usage?
One example is I'd like to be able to say "It's OK if you don't agree with me" but I don't know how to.
(This is a spinoff question as I thought the original was getting too broad. For finer points and examples on using
に同意する to agree/disagree with a person, see also How to use ～に同意する to agree or disagree with a person?)