Theory:

Important!
Most of the countries around the globe ensure equality to their citizens, so as the case with India.
India enforces equality through Indian constitution in the form of Article 14-18.
A gist of article 14-18 is given below:
 
Equality in Indian constitution.png
How to promote Equality:
  1. Treating everyone equally. 
  2. Enforcing inclusive culture - which includes a range of ages, ethnicities, religions and world-views.
  3. Ensuring equal amount of opportunities
  4. Ensuring education to all citizens.