You can get an advanced job when you level to level 18.
You know how there are so many different channels to log onto well the grand flores channels give you extra exp in any map like mirkwood, grakqarak, shadow mirkwood, etc. All sky tower channels give you extra exp in dragonoid nest, puppet master, etc. all the other ones give you extra exp for any map in certain places as well.
When your in a map try to break the barrels and chests you might get a hidden bonus, such as hp refill, mp refill, invisible, armour, etc. and others will poison you explode bring out extra monsters, etc.