DOC:  Data Editing Samples/Guide
#### Location of the documentation

N/A

#### Documentation problem

There seems to be general community confusion over when the use `iloc`, `loc`, `at`, `iat` or the other methods that allow you to update rows and columns.  What is the best way to add a single new row? Multiple rows `pd.concat` something else?  

It would be nice if a guide or doc was created to point to the best practices for data editing on a DataFrame.



