Tutor:Is this mean if learner submit answer this extension help to show feedback on that question?
Yes, it shows the feedback in a popup.
Assessment: To create assessment in Adapt?
Assessment Results:To show pass/fail ?
Yes. This also has the 'retry assessment' functionality. You can actually see that in the screenshot here.
I'm not sure I can give you a better explanation than the one in the README. maybe also look at the demo animated gif in there?
I don't know what this is.
Have you looked at the demo course here? Most of what you are asking about is in there.
I will be working on building course with assessment and I believe I need to use all above mentioned extension?
You don't need to use Trickle but most people like to use it to make Adapt show the assessment questions one at a time so that the learner can't miss one.