can we change domain usually?

[Hothcer]

Yesterday, I read one tip on other forums as following, but I am not sure is it correct? It said: Do not purchase a new domain unless you have to.
The search engines put a lot of stock in how long your website and domain have been around. While you can purchase a new domain and redirect your old one to the new one, your best bet is to use your existing domain/website if at all possible. If you're redesigning or starting from scratch and you have to use a brand-new domain for some reason, you can expect at least somewhat of a loss in search engine traffic. It could be anywhere from a few weeks to a few months or more.

[Armwatson]

You mortal various options to interchange the hosting of your realm.  The initial alternative is the most blunt. You can lenses your bread stuff, and obtain your new host's DNS (Orbit Reputation Computer) Substance. Once you hold their DNS message, you can give to the Domains Next website and update your DNS records online, gaining right to our Area Administrator with your user name and password. Opt the Transfer DNS Info channel, then select the class you wishing to loco mote the hosting for and follow your new DNS content.