Is it true that you should buy all of the possible extensions of your domain name? For instance, houses.com; houses.info; houses.net; houses.biz; Would the reason for this being so you would have a total monopoly on the word? I'm still learning, hopefully.

I'm still learning too ozzie, but I've also heard about that strategy.

Also, I've heard about buying misspellings too. I guess that would probably apply to names a little more complex than "houses" since that one's pretty straight forward.

Yes and no - only buy all extensions if you plan on making a big site, like I own Celrus.com - Celrus.net - and Celrus.org and also own Sinul.com and Sinul.net - working on the .org. Id say the big ones you need to get are:

.Com
.Net
.Org
And country [.us, .ca, .cn, ,uk, etc.]

Only reason I wanted to buy all the Celrus and Sinul ones is so no one can try and profit off my name and such

But if you're just making a little site, you don't need to get all crazy about buying

If you literally had houses.com, then yes you should definitely buy all extensions imaginable.

If you're using your own brand for your very successful site and your brand has not been trademarked then you might want to grab the main extensions.

I would also buy
casa.com if you get it..