Mutual funds in plain words

A mutual fund is a shared basket with a published rule. You buy units. NAV is the per-unit price.

8 min read · Beginner · Updated 2026-09-06

You and many other people put money into a common basket. A published rule says what the basket may hold. You own units of that basket, not a personal cupboard of shares with your name on each.

NAV

NAV (Net Asset Value) is the per-unit price of the basket after costs. When you invest ₹2,000, you buy units at that day’s NAV (subject to how and when the platform processes the order). If NAV later is higher, your units are worth more. If lower, less. NAV is a measuring stick. It is not a grade.

The slow leak: expenses

Running the basket costs money. That cost is the expense ratio - a percentage each year that comes out of the basket. A higher fee is a slow leak. Two similar baskets with very different fees are not the same product.

Direct plans usually cost less than regular plans because regular plans include a commission path for a distributor. 101 only needs the idea: know which door you used, and that fees compound against you.

Equity funds vs debt funds, at 101 height

Equity funds live in the equity room. Debt funds live in the debt room. Hybrid funds mix. Read the room first. Category names (large cap, flexi cap, liquid, gilt) are maps for 201. Do not shop by last year’s colour chart.

Index funds follow a published list (for example a well-known market index). They are the clean first picture of equity: you own a wide slice, the rule is public, the fee is usually low. That does not make them “safe.” It makes them understandable.

**Note:** Yesterday’s one-year return is a shopping-list trap. Funds can look brilliant after a good year and ordinary after a full cycle. Leave picking checklists to 201.

Where it breaks

Collecting twelve funds because each had a “best in class” badge in a different month. Ignoring fees because “it is only 1%.”

  • A fund is a shared basket with a rule, units, and a NAV.
  • Fees are a leak. Know direct vs regular.
  • Understand the room before the star rating.

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Key takeaways

  • A fund is a shared basket with a rule, units, and a NAV.
  • Fees are a leak. Know direct vs regular.
  • Understand the room before the star rating.

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Educational only — not investment advice. Part of First Investments on Finnass Guides. Prefer hands-on tools? Open Calculators or the FIRE calculator.