The example given to you by "just JR" as an absolute path is incorrect. An absolute path ALWAYS starts with /, which is the indicator of the root directory. Absolute paths ALWAYS start with /. A relative path does not start with /.
Also, he shows back slashes in his example. Linux does NOT recognize back slashes. The example he gives would not work for both of those reasons.
These are valid examples of absolute paths:
/opt
/usr/local/src
/home/joe
ALL of these start with /
These are examples of relative paths:
../home/Joe
./Music
Music
Notice that ./Music and Music both do the same thing. They look at the Music directory immediately below the current directory.
A single period means start right here in the current directory.
A double period means jump up a directory level. So, this:
../home/Joe
Would point to the directory Joe, which is under the directory home, which is directly above the current directory.