So when do I use "href=../" and "href=(folder name)/page.html" ??

So I just want to clarify, if the two html pages are in the same folder you can link the page with just the file name? But if they are in separate folders, then you use the "../"? I will set up an example to detail my question more.

Let's say the main folder name is main and the sub is main.html. Now, if there was another existing sub in that same folder titled index.html, then in order to link main.html too index.html I would use:

<nav> <ul> <li><a href="index.html">Home</a></li>

Clicking on home will redirect you to index.html correct?

Now this is if I want to link the pages but they are not in the same folder and the html I am linking from is a sub.

<nav> <ul> <li><a href="../index.html">Home</a></li>

Ok, now this one is if I am in an html page outside of a folder trying to link into a folder. We will leave main as the folder title followed by index.html as the sub.

<nav> <ul> <li><a href="main/index.html">Home</a></li>

Sorry for the long question. Trying to understand it well. Thank you!