Here are some quick ways to format text in your Rmd file. To make an italicized font we use *(text)*, to make a bold font use **(text)**.
For headers, use #(text) for level 1, ##(text) for level 2, and ###(text) for level 3. For example
To make a bulleted list, follow the example (indent for sublevels):
* Item 1
+ Item 1a
to create
For a numbered list, just simply number each line as follows
1. Item 1
2. Item 2
+ Item 2a
to create
Item 1
Item 2