When I'm working with responsive layouts, it helps me to have a quick reference or two nearby to help jog my memory.
This is a cheat that I have printed out and tape to my monitor for when I'm bootstrapping, to remind me which breakpoints are adjacent to each other.
| device | abbr | scales up | |
|---|---|---|---|
| Phone | xs | | | /\ |
| Tablet | sm | | | | |
| Desktop | md | | | | |
| Large | lg | \/ | | | stacks up |