Helpful is a replacement for *help* buffers that provides much more
contextual information.  To get started, try:
`M-x helpful-function RET helpful-function

The full set of commands you can try is:

* helpful-function
* helpful-command
* helpful-key
* helpful-macro
* helpful-callable
* helpful-variable
* helpful-at-point

For more information and screenshots, see
https://github.com/wilfred/helpful