The Parkworld.be coaster guide certainly has no intention to collect all the coaster data of the world.  www.rcdb.com is and excellent source for that purpose and should be your prime reference.
At ParkWorld.be you'll merelly find a broader context and more insight about the coasters rides we have experienced ourselves. Some roller coasters simply have a great historical context. Others hide an amusing story. You might even find some useful side information about a coaster that which you fancy, even if you weren't fortunate enough to experience it up close yourself.

A major category of roller coasters is the one of the steel coasters. There are several types of them, some of which are defined by the type of train or the position of the train towards the track.
There are stand up coasters, where people are literally standing, flying coasters, where one assumes a position as if flying through the traject,...