Nataraja, as a symbol is not a home décor, it is a brilliant invention that gives us a powerful lessons to live life with balanced Purusha (right side of body/mind/ consciousness) and Prakriti (left side of the body/ nature/matter). 
1. Dancing Shiva is in Abhaya mudra, stating not to be afraid of left side. Left side has heart that has the quality of movement, movement relates to changes.

Do not be afraid of change, you may lose something good but you may gain something better. 

2. Dancing figure of Shiva is crushing with his right leg dwarf demon Apasmara, Hindu mythological figure who represents ignorance and forgetfulness. Right side of the body is Purusha that has a quality of stillness. Most of us ignore our past mistakes and repeats it in present.

What is required is to still our mind, “Chitta Vritti Nirodha”, capture the fluctuation of your mind. Remember that being aware of one’s ignorance is first step to get rid of ignorance. 

3. Shiva idol holds in upper right hand the damru, rattle drum, created by two triangles, as in following link of Devdutt Pattanaik, you will hear him sharing knowledge on construction of the rattle drum and its significance. They are barely intersecting with each other that signifies separation of mind & matter, the state of deepest possible rest that is discovered by committed meditation.

As the bondage of attachments ruling Prakriti are gradually broken through progress in yogic Concentration (Dharana) and Meditation (Dhyana), the unbound pure spirit of Purusha is finally separated and liberated from Prakriti as total absorption in God (Samadhi) is experienced.

4.His upper left hand holds Tapas, fire of mind to overcome all fears & bounds of life.

The science of conquering fear is living in an authentic manner – express your actual feelings, desires and thoughts.