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so if i were to make a website on my own, for another person which would i use "../" or "/"
You would always use "/" to access the root directory of any website on a server -- the start of a root relative path (as in <a href="/">home</a>).
Servers that host many different websites will be configured so that they can 'pretend' each site is unique on the server, and each site on the server will have its own root directory.
Servers that host many websites will often specify a directory to put webpages in (something like httpdocs or public_html) and each website will have a directory with this name. This directory will be the "/" for each site on the server.
You can also specify the first page that should load from the directory when the root path is accessed (usually index.html by default -- but this can be changed to index.php or main.js, for example). Therefore, the start of the root relative path for your website will bring up this page.