An Index Fund such as Nifty 50 passively mirrors the index. Whereas an actively managed fund charges a slightly higher expense ration (about 1%) but has an expert fund manager who is able to pick stocks based on various criteria.
So far in India, many actively managed funds have done well and are lily to do so for the next 5–6 years. This is because of the way the Index is constructed and how specific stocks enter/ exit the index, mostly after they have had a good/bad run.
Invest in direct plans on a platform like Jama.co.in to avoid broker commissions, and earn upto 40% more in long term. There is also a good selection of the best fund available as per your individual risk appetite.