Game Modes

Single Player
This mode allows you to create a custom character and play against the computer in the courses available to you. Any character you create here can also be used in both ONline and OFFline Multiplayer modes. Single Player mode improves your character (see  Improving Your Character  below).

ONline Multiplayer
Participate in multiplayer matches online with other players from around the world. In this mode, each player must use a separate PS4 console. It is not possible for 2 or more players on the same PS4 to participate in ONline Multiplayer mode. ONline Multiplayer mode improves your character (see  Improving Your Character  below).

OFFline Multiplayer
Participate in multiplayer matches on a single PS4 console. These matches are offline and limited to 4 players in your home. In this mode, each player must use a separate controller and you can choose which player goes first. OFFline Multiplayer mode  does not  improve your character (see  Improving Your Character  below). Instead, you can use the stats from your custom character or one of the 3 presets (High, Medium and Low). See  Making things Fair  for tips on handling players with different skill levels.

PRO TIP
If, like me, you have a family that wants to play together on the same console, but you also want the enjoyment of building your skills and unlocking things, the old pass-and-play method is a good way to do it. Try this: Start up a Single-Player or ONline Multiplayer match and then pass the controller between holes. This let's everyone have a hand in unlocking clothes, clubs, balls, and courses and all those things can be used individually in OFFline Multiplayer mode. IMHO they should add a "Co-op Mode" to OFFline Multiplayer which advances the core stats in the same way but still lets you use separate skins and controllers.