MMORPG

[majimboo]

can I use this for an MMORPG server? How can I dynamically create an entity? Like there will be a lot of entities and data will be different for each of them.

[JestDotty]

MMORPGs are very very complicated creatures (see this for a time estimate calculator: http://yourgameideaistoobig.com/)

This will help with networking in a lobby game (and with a MMORPG you'll probably use something like chunks to create mini lobbies, maybe? I'm just reaching, haven't done it myself): http://buildnewgames.com/real-time-multiplayer/
And these are a couple of good articles I stumbled upon to find out how to build with CES/ECS frameworks:
http://gamedevelopment.tutsplus.com/tutorials/create-a-simple-asteroids-game-using-component-based-entities--gamedev-1324
http://www.gamedev.net/page/resources/_/technical/game-programming/case-study-bomberman-mechanics-in-an-entity-component-system-r3159

My favourite resource for gamedev information is probably this subreddit: https://www.reddit.com/r/gamedev