Automatically number sections in RMarkdown

Question

I am trying to create a report in R markdown that has sections ordered

1. Section 1 Header

   1.1 sub section 1

   1.2 sub section 3

Answer 1

Add the option number_sections: true to your YAML header:

---
title: "My Report"
output: 
  html_document:
    number_sections: true
---

# Main Section

## 2nd Level

### 3rd Level

And voilá, your sections are numbered: