> You can configure the textwidth to be used in HardPencil (hard line break) mode when no textwidth is set globally, locally, or available via modeline. It defaults to 74, but you can change that value in your .vimrc

Suggestion: use 72. It's divisible by 2, 3, 4, 6, 8, 9, 12, 18, 24, and 36, simplifying tables, columns, centering, etc.