I haven't found any new tutorials for the doors and how to set them up, so I will make this tutorial.
All you need is basic OpenTibia knowledge, primarily scripting and mapping.
Locked Door
To use and set up locked doors, you must create a key with a special action ID; to match it with a locked door, the door must have the same action ID as the key as well.
For example: A key with the action ID of 1234 will open any locked door with the action ID of 1234.
Door of Expertise (Level Door)
To use and set up doors of expertise, you just only have to set the action ID of the door.
The first number of the action ID must be 1 (don't ask me why), then the next three numbers will be the level of the door that a player must be to enter.
For example: If you want players that are level 50 and over to enter, set the action ID of the door to 1050.
Quest Door
To use and set up quest doors, you must give the player a storage value; to open a quest door, the door must have the same number as the storage value in the action IDs field.
For example: Click an object to give you a storage value of 1234, you will be able to open any quest door with action ID 1234.
All you need is basic OpenTibia knowledge, primarily scripting and mapping.
Locked Door
To use and set up locked doors, you must create a key with a special action ID; to match it with a locked door, the door must have the same action ID as the key as well.
For example: A key with the action ID of 1234 will open any locked door with the action ID of 1234.
Door of Expertise (Level Door)
To use and set up doors of expertise, you just only have to set the action ID of the door.
The first number of the action ID must be 1 (don't ask me why), then the next three numbers will be the level of the door that a player must be to enter.
For example: If you want players that are level 50 and over to enter, set the action ID of the door to 1050.
Quest Door
To use and set up quest doors, you must give the player a storage value; to open a quest door, the door must have the same number as the storage value in the action IDs field.
For example: Click an object to give you a storage value of 1234, you will be able to open any quest door with action ID 1234.