You can use
/
to access the root folder,
../
to access a parent folder, and
./
to access files/folders in the current directory.
So assuming Sites is your root folder, you can access menu.js and style.css in two ways:
Going to the parent folder, and then into the inc folder:
../inc/menu.js
&
../inc/style.css
Or Navigating to the root folder and then down to the inc folder:
/inc/menu.js
&
/inc/style.css
For the house.jpg, it's in the same directory as the index.html, so you can use
./house.jpg
or just
house.jpg
The full HTML tags would be:
HTML:
<link rel="stylesheet" href="/inc/style.css">
<script src="/inc/menu.js"></script>
<img src="house.jpg">