If you need to know what symbols Unity uses for conditional compilation check out the docs page Platform Dependent Compilation

You can use Application.ExternalCall to call JavaScript functions on the page the web player is displayed in.

Did you know you can pass in command line arguments when running Unity as well as with the standalone players! Read Here.

If you need to get more detailed logging information check out the Log Files page. 

If you have a modal with animation(s) you can export the model without any animation. Then export additional copies of the model with animation and with the same name but with “@animationname” at the end of the file name. Read the section on “Importing Animations using multiple model files” here.

If you need to know what platform your code is running under you can use Application.platform.

If you need to run some script code as soon as the editor has launched you can use the InitializeOnLoad attribute.

With scripting you can add menu items that have shortcut keys assigned to them. Read the MenuItem description for more information.

A great way to help debug your game is to use Gizmos to visually represent empty game objects in your scene.

Check out BurgZergArcade's youtube channel with over 200+ unity tutorial videos.

 When working with multiple duplicate game objects you may want use tags to uniqely identify a specific object.  You can then use GameObject.FindGameObjectsWithTag to select that specific object in your scripts.