Layers

layer is a drawing object. layer corresponds to a div or other element in html.

Project

Project is a managed object that can contain various ArtBoards. It is not displayed on the screen. It is only used to store assets or other settings that can be used by multiple ArtBoards.

ArtBoard

It is a basic board for drawing on the screen. One or more layers are added here.

Layer Tree

Show a list of nestable layers. You can delete, show and select individual layers.

Clicking on a layer makes it selected and you can also check the selected state in ElementView