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I suggest that you should first read a high school level textbook on civics to get the basic ideas and framework of our constitution. After that, you can read elaborate articles on it.
In nutshell, the constitution is the supreme law of our nation with the help of which Govt runs the country. During the British rule, we did not have a composite constitution as different princely states had their own rules and regulations. It is only in the independent era that a complete constitution was chalked out and enacted.
The Indian constitution provides fundamental rights to its citizens and is designed to create and run a democratic setup.
The basic premises on which our constitution is build up is that there will be social and economic equality in our country and there will be no discrimination based on caste or gender. Every citizen will have equal rights and opportunities to get jobs and earn their livelihood.
It further says that government will not favour any one religion. It will respect the presence of Muslims, Sikhs, Christians and any other religion that someone chooses to follow.
After covering the above aspects you can briefly highlight the various amendments to the constitution which were time to time incorporated to bring in more clarity and precision in our constitution. It is a continuous process and it will evolve further based on the changing facade of our country in national as well as the international stage.
Knowledge is power.