You're given a hook. If you reel in materials, you can build a spear, distiller, campfire, and fishing rod fairly fast. Once you have that down, raft expansion is easy, and you can build nets. Since the shark only attacks every so often, you can spend your time building and gathering what your nets have collected.
If anything, some form of guidance on teaching that the hook can reel in floating materials needs added, or perhaps how to craft for water and food. It's terribly easy once you start up, as long as you know how to get started.