2nd melee contest poll started, in the link you can (if you wish) download all the maps from the zip file, see them all and rate what do you think are the 5 best maps. If you don´t have competitive melee knoledge, is okay, you can use other criteria like: enviroment, effort, map shape and others. The general public opinion is important to define 20% of the final score https://www.hiveworkshop.com/threads/melee-mapping-contest-2-poll.308814/v
Cameras are essentially preset locations/angles that the game camera can be instructed to move to (either instantly or over time).
Telling the game camera to move to a camera location is done via cinematic triggers, ideally while the game is in 'cinematic mode' (which disables user control and enters a sort of 'letterbox format' that can show subtitles at the bottom). Of course, you don't HAVE to enter cinematic to trigger the camera to move around, just be aware that if you don't, the player can still override the camera's triggered movements with their own commands.
Unfortunately it's not a quick or easy thing to teach everything there is to know about triggers and cameras. By far the best way to learn (and indeed, how I learned it) is to play around in the map editor yourself, and look up tutorials and search forums. There are plenty of tutorials for the World Editor out there.
However, if you've already given it a shot yourself but still have specific questions, feel free to ask.