Don't forget your ML fundamentals/Rules that apply to ML also apply to DL

**Have you checked the [list of proposed rules](https://github.com/Benjamin-Lee/deep-rules/issues?q=is%3Aissue+is%3Aopen+label%3Arule) to see if the rule has already been proposed?**

- [x] Yes

**Feel free to elaborate, rant, and/or ramble.**

Maybe we could dedicate one rule to ML basics that people still don't seem to get right, which, although they are not DL specific, still apply to it. Issues #1, #19, #20, #21 all come to mind. This could possibly be rule one.

Start by reviewing the proposed-rules list and the referenced issues #1, #19, #20, and #21 to identify the ML fundamentals being suggested. The issue is complete when the project has agreed on and documented a specific rule covering applicable ML and DL fundamentals.

Written by the indexing model from the issue text.