The contact page is of course part of a good basis. But it's so important that we'd like to give it some special attention. On the contact page you have to put your company details (name, address, KVK and VAT number) and all your relevant contact details (mail, telephone number, and possibly social media). This way, customers have everything at hand and can choose how to reach you.
Extra tip:even a contact form usually works well, but keep in mind that visitors do not like to leave their phone number. Just ask for an email address, for example, or make entering a phone number optional!