Feared about blowing up your Arduino, how about simulating Arduino

Intro

Arduino Simulators makes it easy to develop more quickly without damaging your Arduino board. It also saves money as you can test out a specific sensor, IC before buying to check if it's suitable.
So let's get started with.

Arduino Simulators

Autodesk Circuits

It is an online browser based Arduino Simulator. It is very good for a beginner as it is very easy to use (Really very EZ PZ).

Pros

Easy to use
Free
Some Sensors, ICs, Electronics Devices are available
Good for beginner
Easy Editing

Cons

Lack other Programmable boards, Very few selections of boards
Few IC, tools are available
Very basic editing feature

Site Link

VBB4Arduino

Virtual BreadBoards for Arduino. Available for Windows. A great arsenal of parts, and easy to use. Easy to use, can be little difficult for the new user.

Pros

Easy to use
Great library of parts

Cons

Not Free, even for Educational use

Site Link

Virtronics Simulator For Arduino

Available for Windows. Just like VBB4Android with some more features.
Site Link

Other Tools worth checking out

Autodesk Eagle

Free for educational use, it is very advanced. Difficult for a beginner.
It comes with a SPICE Simulator (a powerful electronic simulator).
Huge library of parts.
Site Link