Warnings vs Stop

We often want to give feedback to the user. This can be done using the message(), warning() or stop() functions.

Which of the following statements is correct?

50 XP

There is no difference between using warning() and stop() - they both give a helpful feedback.
press1
Warnings are used to inform the user of progress during an operation.
press2
Using stop() indicates something has gone wrong in the code and so code execution stops.
press3