Check out example codes for "path in html". It will help you in understanding the concepts better.

Code Example 1

<!--The ./ means the contact.html file is in the same file 
as the file that is linked to it-->
<a href="./contact.html">Contact</a>

Code Example 2

/   = Root directory
   .   = This location
   ..  = Up a directory
   ./  = Current directory
   ../ = Parent of current directory
   ../../ = Two directories backwards

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