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Coronal, axial, sagittal are different views to see the pathology ( problem) (anteriorly, side way, up to down in common language) Stir,T1,T2 are sequences in which structures are better visualised.
Disk is present between the
vertebral body causing the shock-absorber function in weight bearing, this disc contains good % of water - when this water content is lost the disk starts slipping / herniating out ( age related degenerative cause and traumatic cause, excessive usage).
in your case the disc has slipped backwards and causing pressure effect on the spinal chord at L5-S1, compressing on
nerve at S1 level and
disc disease noted at the level L5-S1. Exercise will help followed by
physiotherapy. Good luck
Hope it helps you. Wish you a good health.
Anything to ask ? do not hesitate. Thank you.