: How to instruct browsers to clear any pages from our site from cache? Our old website on our old host did this... When you load www.example.com it quickly redirects you to www.example.com/main.

@Courtney195

Your best option is probably to set a 301 redirect from example.com/main to example.com on the new server. It'll take some time for DNS to propagate, but once it does the 301 will be what you want.

This will tell browsers to send users to the new/correct homepage and alleviate the 404 issue for them. It also informs search engines of the new homepage so that they will reflect the correct URL too. Best for users & SEO!

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@Chiappetta492

We often tell our clients that a DNS change can take up to 3 days, but that it often doesn't take that long.

You have made changes to your hoster, this has to be updated to their "Nameserver" until it reaches all involved parties. You have a TTL, Time To Live, you can see this as your case. Say your TTL is 8 hours, and someone did a request, they return that result until 8 hours have passed, then they'll check again with your nameserver. Sometimes you're lucky and you get new visitors or the 8 hours have just passed, other times they've just checked and you're gonna have to wait.

Tip for the next time: Set your TTL to 1 hour before you switch. This way you tell everyone "Hey, check again in one hour", which means it takes one hour at most for everyone to switch.

At this point, there is little you can do, because every setting you set, will not be viewed until the current cache has expired. If you're talking about a few users, you can try to get them to flush their DNS locally, that often might to the trick.
You might want to add a /main to your new website so you can at least catch the visitors and do something with them ("Welcome to our new site, sorry this page doesn't exists, maybe you want abc).

*There are some nuances to this, but this is the basic explanation

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