This is a ‘sailor-stitch’. The first simple stitch may then be doubled back to strengthen, though this is not absolutely necessary. Similarly the last stich may also be doubled, or the middle one. This is called ‘prior-stitching’.
Otherwise it is ‘simple-stitching’ only vible along the underside of the k’laf because of the fold over.
The last stitch loops through the ‘prior-stitching’ twice an pulled tight to knot the giidin securely. The excess giddin is then cut off close to the knot.
Glueing on re-inforcement strips of parchment is an option, however not really necessary for a new work. However on repairs to sewing on old scrolls they can be valuable. They should not be positioned right up to edges either. (remember the glue must be kasher - a sythetic PVA will do if glue made from old k’laf boiled is not available.