As active as the research is on the various possible uses of 5G and B5G (beyond 5G), we herein make a tutorial and review on the existing spatial coupling techniques that are used in the protograph-based design of Spatially Coupled Low-Density Parity-Check (SC-LDPC) codes. We unroll useful details for the computing of these techniques, implement them in the context of the 5G standard and draw up their performances. As a main result in terms of lesson learnt, a guide is provided to select the most appropriate spatially coupled technique for the three main 5G services and for three of its numerous use cases. Three research tracks are pointed out.