Refer and Reinvite Messages?

I want to ask a general question about understanding SIP message.
Why and when we use “refer” message?
Why and when we use “reinvite” message?

Refer. To request a blind transfer or attended transfer, on a call that is up. (In theory there are other uses).

Re-invite. To change characteristics of the session, such as end points, or to reset inactivity timers.

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Attended transfer and blind transfer can be done via re-invite?

Refer create new session?but re-invite does not create new session?re-invite modify previous session?

A re-INVITE doesn’t allow an attended transfer or blind transfer to be done, just modify one as mentioned.

A REFER itself does not create a session. It informs an entity that it should contact someone else.

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