> For the complete documentation index, see [llms.txt](https://sheldonldev.gitbook.io/sheldon-loves-dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sheldonldev.gitbook.io/sheldon-loves-dev/learning-path/playground.md).

# Playground

## Coding

* <https://coderbyte.com/>
* <https://leetcode.com/>
* <https://lintcode.com>
* <https://hackerrank.com>
* <https://www.dotnetperls.com/>
* <https://check.io/>

## Cron

* <https://cron.help/every-day-at-midnight>