A tour of the editor

The editor's panels, toolbar, viewport controls and shortcuts.

The panels

Panel	What it's for
Scene	Everything in your scene, as a tree. The dropdown at the top switches between scenes, or adds a new one.
Inspector	All about whatever you've got selected: its components, tags, layers, script and properties.
Viewport	The 3D view, in the middle of the window.
Assets	Your project's content, in folders. Search it, Import... things, or make something with Add.... See projects.
Console	Logs, plus a spot to type commands. See Console & CVars.

Asset editors open as panels on the right. To restore the default layout, use Layout › Reset Layout in the gear menu.

There's no menu bar. Everything lives in the toolbar, roughly left to right:

New Project, Open (its arrow lists recent projects) and Save.
Undo, redo, copy and paste.
Select All, with Select All in Viewport and Select None under its arrow.
Layers, and the active swatch.
Bake, for baking lighting.
Add, for putting new things in your scene: lights, probes, volumes and more.
Translate, Rotate and Scale, to pick what the gizmo does, plus grid snapping. The arrow next to snapping has the grid settings: snap size, rotation snap and offset.
Mesh tools, terrain tools (sculpting and painting) and paint tools (decals, instances and ground cover).
Build, for building and packaging your game.
Play, Pause and Stop. More in play-in-editor.
The gear menu, with World Settings, LOD, Ghost Mode, Show Stats and Layout.

Viewports

The gear menu's Layout picks how many viewports you get:

Layout	Views
Single Viewport	One perspective view. This is the default.
Four Viewports	Top and Front above, Side and Perspective below.
Perspective + Three	A large perspective view, over a row of Top, Front and Side.

In the Top, Front and Side views, drag with any mouse button to pan, and scroll to zoom.

Viewport controls

Action	Input
Look around	Left-drag
Pan along the ground	Right-drag
Pan up, down and sideways	Left + right drag, or `Alt` + drag
Fly	`W` `A` `S` `D`
Let go of the mouse	`Esc`

On a trackpad, hold Ctrl in place of the right mouse button. Camera speed and mouse sensitivity are set with the Editor.Camera.MovementSpeed and Editor.Camera.MouseSensitivity CVars.

Shortcuts

On macOS, use Cmd in place of Ctrl.

Action	Shortcut
New project	`Ctrl` + `N`
Open project	`Ctrl` + `O`
Save project	`Ctrl` + `S`
Save project as	`Ctrl` + `Shift` + `S`
Undo	`Ctrl` + `Z`
Redo	`Ctrl` + `Y`, or `Ctrl` + `Shift` + `Z`
Copy, paste	`Ctrl` + `C`, `Ctrl` + `V`
Select all	`Ctrl` + `A`
Select none	`Ctrl` + `Shift` + `A`
Delete	`Delete`