I need help with making a teleporter. To give you an idea, here is a link to a game that I am basing for my unity game: Alter - ContentDB
Here is a video of it to give you more of an idea:
https://www.youtube.com/watch?v=Yb99UAqf2J8
I have no idea how to make something like this in unity, and I would really appreciate it if I could get some help. If you know coding, that would help a lot. Thanks!
Quite frankly, im unsure what your question is. Simply setting the (player) position to some value is teleporting the object there. You oftentimes do this every frame, for example in movement scripts. Usually the hard part is making it look less like an abrupt teleportation 
But if that’s what you want, then what part do you have problems with?
Have you done anything with Unity, or any other game engine so far?
If it’s some other aspect of what you posted which you have problems with, you should clarify your question. If you want to teleport to the same location in the other room, simply add or subtract the length of your room from your position. If you want to reflect the position in respect to the wall, there is probably functions for that too, depending on what specifically you want.
I know coding and it helps me a lot every day.
However, your job is to learn coding too, and then it can help you a lot.
I am not any smarter than you , so I know you can do it.
Here is how. Start with tutorials. LOTS of tutorials, stuff like this:
Tutorials and example code are great, but keep this in mind to maximize your success and minimize your frustration:
How to do tutorials properly, two (2) simple steps to success:
Step 1. Follow the tutorial and do every single step of the tutorial 100% precisely the way it is shown. Even the slightest deviation (even a single character!) generally ends in disaster. That’s how software engineering works. Every step must be taken, every single letter must be spelled, capitalized, punctuated and spaced (or not spaced) properly, literally NOTHING can be omitted or skipped.
Fortunately this is the easiest part to get right: Be a robot. Don’t make any mistakes.
BE PERFECT IN EVERYTHING YOU DO HERE!!
If you get any errors, learn how to read the error code and fix your error. Google is your friend here. Do NOT continue until you fix your error. Your error will probably be somewhere near the parenthesis numbers (line and character position) in the file. It is almost CERTAINLY your typo causing the error, so look again and fix it.
Step 2. Go back and work through every part of the tutorial again, and this time explain it to your doggie. See how I am doing that in my avatar picture? If you have no dog, explain it to your house plant. If you are unable to explain any part of it, STOP. DO NOT PROCEED. Now go learn how that part works. Read the documentation on the functions involved. Go back to the tutorial and try to figure out WHY they did that. This is the part that takes a LOT of time when you are new. It might take days or weeks to work through a single 5-minute tutorial. Stick with it. You will learn.
Step 2 is the part everybody seems to miss. Without Step 2 you are simply a code-typing monkey and outside of the specific tutorial you did, you will be completely lost. If you want to learn, you MUST do Step 2.
Of course, all this presupposes no errors in the tutorial. For certain tutorial makers (like Unity, Brackeys, Imphenzia, Sebastian Lague) this is usually the case. For some other less-well-known content creators, this is less true. Read the comments on the video: did anyone have issues like you did? If there’s an error, you will NEVER be the first guy to find it.
Beyond that, Step 3, 4, 5 and 6 become easy because you already understand!
Finally, when you have errors…
Remember: NOBODY here memorizes error codes. That’s not a thing. The error code is absolutely the least useful part of the error. It serves no purpose at all. Forget the error code. Put it out of your mind.
The complete error message contains everything you need to know to fix the error yourself.
The important parts of the error message are:
Always start with the FIRST error in the console window, as sometimes that error causes or compounds some or all of the subsequent errors. Often the error will be immediately prior to the indicated line, so make sure to check there as well.
All of that information is in the actual error message and you must pay attention to it. Learn how to identify it instantly so you don’t have to stop your progress and fiddle around with the forum.
Okay, thanks for that. I’ve done a little bit of Unity, but not much so far, so I felt a little stumped at this block. I think I can figure it out, because I mean some other people were telling me that maybe I could do something like, just teleporting the character to the other side, but at a negative position. Then I thought, what if there were walls, which then my friend said to just put the character out at the closest position to the negative. Thanks for your help. I guess I just felt like I needed to do everything at once, and I didn’t break it down. I’ll try doing that, and who knows? Maybe it’ll work?