What are the 3 main sectors of the economy?

The 3 main sectors of the economy are primary, secondary and tertiary sectors. Manufacturing comes under the secondary sector, extraction of raw materials industries comes under the primary sector of the economy and the services industry comes in the tertiary sector of the economy. You can read about the Make In India – Initiatives, Aims, Advantages & Challenges [UPSC Notes GS-III] in the given link.

Further readings:

1. Department for Promotion of Industry and Internal Trade (DPIIT) & DIPP – UPSC Notes
2. 10 Maharatna Companies – Central Public Sector Enterprises (CPSEs)