A full list of rule changes for 2017 season can be found here, but some of the more important ones to note are:
The kick-off can now go backwards.
The Offside law – the free-kick is now taken from where the offence of offside took place, so the interfering in play, rather from the offside position – referees will understand what that means.
Undershorts/tights must be the same colour as the main colour of the shorts or the lowest part of the shorts. This takes into account shorts with a different coloured hem. Undershirts must still be the same colour as the main colour of the shirt sleeve. Any tape or other material on or covering socks must be the same colour as the sock.