• Sometimes the entrance elevator doesn't move at the beginning of the map and I have to reload.
• The test chamber sign. I made a new sign for my chamber and at first it just said "00-None", then it worked, then it stopped again. (Actually, I think I might have a solution. Bear with me...)
• Loading screens always display Apocalyptic Aperture Science. I'd like to use the clean sign instead.
• Map transitions. At the end of the map it fades to darkness whilst still keeping the sound. I'd like to transition to a new chamber.

Also, .vpks don't like me. I tried installing "Discovery" from the community spotlight in a new addons folder and the game wouldn't even load up until I got rid of it. Yet I understand that in order for other people to have my transitions to the next test and the sign I need to put it in a vpk. What should I do?

Steam/steamapps/common or username/portal2/portal2/scripts/vscripts/transitions
Elevator, loading, test sign

The cool part is valve has given you the instructions in the file already, so no need to look it up

Name the trigger
Name the test chamber in the trigger
Then name the landmark
Then type the name of the landmark in the trigger

I have no idea what I am doing!

First, make a block where you want to transition to the next level
Then add the trigger texture, then tie it to a trigger_changelevel
Then make an entity in the middle of the trigger, an info_landmark
Name the info_landmark
Change the properties of the trigger
Change the level name and the name of the landmark