References
The full picture, once you've used a piece of it
References are most useful after you've already needed them. Build something first, then come back to a reference to fill in the corners.
General
Arrays — reference
Arrays in JavaScript: indexing, mutation, iteration, the methods that survive the test of time, and the ones that do not.
CSS card — reference
One-liner reference for the card project’s properties — scan, copy, and open the live example.
CSS card — cheatsheet
The box-model card at a glance — the handful of properties that do the work, ready to copy.