If you want to set up a contact page for people to be able to reach out to you, the simplest way is to set up a simple page like this and list the different ways people can reach out to you.
For example, here's how to reach us!
If you prefer to use a contact form, almost all of the great embedded form services work great with Ghost and are easy to set up:

Brought to you by RevGenius
Join the RevGenius community.
We’ve built a community of sales, marketing, and revenue operations professionals to help empower you.
Join Now