It goes without saying that it is important that both existing and potential customers can get in contact with you. And preferably fast. Therefore it's a good idea to gather all your contact information on one page so that your website visitors can get a quick overview of who they should contact and how. The contact page must contain phone numbers, emails and the name and address of the company as a minimum. If you have a physical store it is also important to show the location on a map (Google map).
You can also choose to have a form on the contact page because it allows you to define what information the visitors should provide when they contact you. For example what products their question is regarding or when they wish to be contacted by a seller. In that way you can get off to a great start with your customers and give them a better service experience.