Mutual Funds is a pool on money managed by a professional fund manager. In this , fund is collected from a number of investors and the same is invested the in equities , bonds, money market instruments or other securities.
Before investing , throughly check the performance of the fund in which you want to invest . compare the 3 - 5 years performance of the funds as well as the consistency of the fund.
Funds With larger AUMs have large number of investors funds corpus at their disposal. Thus it becomes difficult for funds with larger AUMs to enter or exit from investing in particular entity. However, the former ones are generally more stable compared to funds with low AUMs.