My main two: 1) "Overview and Zoom" is a common UI technique where you give an overview and then let a user click on stuff for more detail. In programming, thi

My main two: 1) "Overview and Zoom" is a common UI technique where you give an overview and then let a user click on stuff for more detail. In programming, this means writing the "intention" as a method that's very easy to read, then have a bunch of helper functions with the details. This also forces you to only use one level of abstraction per method. 2) Only have one thing happen per line. This forces you to give what you're doing a proper name (as a variable assignment before you use it). This makes it easier to read, but makes all text processing tools work much better with your code. Nothing is more annoying than seeing a diff in a pull request where one line changes, but there are 10 things happening in that line and only one changed.