How to use a domain?
If you have your own domain name it should be used actively. Firstly, for the most important things - your website and your e-mail address. It looks rather strange if a website has its own domain but e-mail address uses the domain of the e-mail service provider or a domain of a well-known free e-mail service, e.g., gmail.con. You have your own domain name! Use it for your website and for your e-mail address!
But the use of domain name is not just a technical matter. It is also a vital part of a successful marketing campaign to build your online image.
On the internet your domain name gives the first impression about you.