Trying to make a hexgrid tile like civilisation.

I am trying to create a strategy game with a hexgrid like civilisation and function the same. I have seen several youtube tutorial but all of them seem to make the landscape hexagon not just as an overlay over the landscape. I am aware that this may be to much to ask for help, as there will undoubtedly be multiple steps to make this. If you know of any tutorials that do exactly this that is appreciated aswell.