Update 'README.md'

README.md

@@ -1,3 +1,15 @@
 # digitalocean-bastion
 
-DigitalOcean Bastion Host Setup 
+DigitalOcean Bastion Host Setup 
+
+## **What is a Bastion Host?**
+
+A bastion host is a special-purpose computer on a network specifically designed and configured to wiHomethstand attacks. There are two common network configurations that include bastion hosts and their placement.
+
+The first requires two firewalls, with bastion hosts sitting between the first "outside world" firewall, and an inside firewall, in a DMZ. Often, smaller networks do not have multiple firewalls, so if only one firewall exists in a network, bastion hosts are commonly placed outside the firewall.
+
+## **Getting Started**
+
+You can use the referral badge below to get started with a $100 credit from Digital Ocean or use this link to [DigitalOcean](https://m.do.co/c/42cf2120197b).
+
+[![DigitalOcean Referral Badge](https://web-platforms.sfo2.cdn.digitaloceanspaces.com/WWW/Badge%201.svg)](https://www.digitalocean.com/?refcode=42cf2120197b&utm_campaign=Referral_Invite&utm_medium=Referral_Program&utm_source=badge)