For the love of all that is digital HOW!?...
 

How do I open a folder with that blasted terminal thing!?

cd /folder/

cd /path/to/folder/

if you want to open a sub folder:

cd ./folder/

. means current directory

Wanna go back 2 folders?

cd ../../folder/

.. means go back (basically)

Oh. Thanks. Googling didn't help because none of the results made any sense.

Also...
 

When in a folder
$ cd subfolder
also works fine for changing to a subfolder, tab completion is also supported with any method so
$ cd sub[TAB]
will put out
$ cd subfolder
assuming you havbe no other folders starting with sub

That blasted terminal thing is the source of all power....;)
Head over to tldp.org and get a copy of "Bash Guide for Beginners" by Machtelt Garrels. Also handy is:
info coreutils (lists all the most common terminal commands)