Cybersquatting

Well, all you have to do, is domain registration. For that you need access to Web, e-mail account (free and anonymous account is perfectly all right) and few bucks, because in most cases domain costs you just about 10 dollars or so.

O.k. if you want all domains with the same word and all important extensions (.COM, .ORG, .NET, .INFO and so on) and maybe variations of the word, we can talk about investment, but we can still easily stay under 100 dollars.

If you can sell domains later for several hundreds EACH, we can still make good money almost without effort...

Some examples of cybersquatting:

Typosquatting is based on misspellings:
WONTED-NAMEdotCOM instead WANTED-NAMEdotCOM
or
WWWWANTEDNAMEdotCOM instead WWWdotWANTED-NAMEdotCOM
In these cases squatter use common misspellings with bad intention to redirect traffic from real site to his fake one. This is called trafficking.

Registering same name with different extension:
KNOWN-COMPANYdotCOM (real company's adress)
and
KNOWN-COMPANYdotNET (squatter's adress)

Registering real name beacuse of real company's forgetfullness
KNOWN-COMPANYdotCOM (real company's adress expired few days ago)
KNOWN-COMPANYdotCOM (real company's adress in squatter's hands just few days after)