Obviously well written documentation is never easy and documentation format also depends on use case. For most of my needs Markdown is good enough. It's easy to

Obviously well written documentation is never easy and documentation format also depends on use case. For most of my needs Markdown is good enough. It's easy to learn, easy to use and well supported. I like to think that its simplicity (or lack of features) forces me to just focus on simple text to write easy to understand documentation.