Cell operations in Quiver are very powerful, while intuitive to learn.
The most important one is to create a new cell, which you have already learned. Press “shift+return” (⇧⏎) to create a new cell just below the current cell. By default the new cell is created as a text cell, but you can easily convert it to other cell types if you like.
There are several ways to convert one cell type to another. You can use the popup button in the toolbar, or keyboard shortcuts (⌥⌘1 to convert to a text cell, ⌥⌘2 to convert to a code cell, ⌥⌘3 to convert to a Markdown cell, ⌥⌘4 to convert to a LaTeX cell, ⌥⌘5 to convert to a diagram cell). You can find these options under the “Cell” menu.
Another important cell operation is to merge two cells. Simply place the cursor at the beginning of the second cell, then press the “backspace” key. Note that you can’t merge cells of different types.
Sometimes you might want to add a new cell at the current cursor position. You can use the "New Cell At Cursor" (⇧⌘I) menu item to do that.
You can also cut, copy or paste a cell, split a cell, move a cell up or down. All these cell operations and their corresponding keyboard shortcuts can be found under the “Cell” menu.