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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