Developing multiplayer games is difficult, even though Construct 2's Multiplayer object takes care of many of the complexities for you. In the same way the events to every game are different, the way multiplayer messages and data are handled will depend on the type of game you are making. As a result the Multiplayer object has relatively abstract general-purpose features so you can make best use of it for your particular game. To make best use of these features it is important to understand how multiplayer online games fundamentally work, the problems that arise, and how they are resolved.
If the features are used incorrectly, your game could end up being unnecessarily laggy, have strange and difficult bugs, or make it possible for players to cheat. While you may be keen to start designing your multiplayer games as soon as possible, it is strongly recommended to read through the complete set of multiplayer tutorials before starting. Additionally this should be considered an advanced feature: beginners may find it very difficult, and intermediate users may find themselves stretched.
If you're ready to begin learning how multiplayer games work, read on!