To move around in Aetolia, you will first want to type LOOK, QL or EXITS in order to see what the exits are from the room you are in. You'll find the exits at the end of the description for the first two, and to see what is beyond an exit, you may type GLANCE <direction> or just GL <direction>. To move in that direction, you simply type the direction, as seen below:
Sometimes, you will encounter doors. A door may be open, closed, or locked closed. To try to open a door that lies to the north of you, the syntax would be OPEN DOOR NORTH or OPEN DOOR N. To close a door to the north, you would type CLOSE DOOR NORTH or CLOSE DOOR N. (As you can see, directions can generally be abbreviated in the ways shown above.)
Naturally, before you can open a locked door, you must unlock it. To do so, you must obtain a key for the door, which may or may not be possible, depending on the door. There are other ways to bypass doors, but those are for you to discover. To lock a door to the north, assuming you are holding the proper key for it, you would do LOCK DOOR NORTH. The syntax to unlock a door to the north is UNLOCK DOOR NORTH.
There are many ways for insidious players to hinder your movement, and you would be well-advised to learn how to prevent them from doing so.
See also: DOORS, LOCKS, KEYS