Snap guides line up a card with the cards around it

Drag a card on a BaseHalf canvas, and snap guides help you line it up with the cards around it. When the card comes into line with another card's edge or its center, a guide appears and the card settles on that alignment.

You can still put a card anywhere. The guides only pull when you are already close to lining up.

A set moves as one

Click a card to select it. Shift-click adds a card or takes one out. Drag a box from an empty part of the canvas to select every card it touches.

Two or more selected cards are a set. A set moves as one when you drag it, and snap guides still help you line that set up with the cards around it.

What snap does not do

Snap guides only help while you drag. They do not rearrange the canvas on their own.

Arrange lines up the selected cards with each other, as a Grid, Row, or Column. Tidy Canvas lays out every card on the current canvas along its connections, then asks if you want to keep that arrangement. Use those when you want a layout applied for you. Use snap when you are placing a card, or a set, by hand.

Card places stay in the folder, under .bh/, and out of git, as the canvas and cards docs explain. Snap only changes those places while you drag.