To indicate a smaller amount or degree.

कम

English Usage: The less experience you have, the more you need to learn.

Hindi Usage: आपके पास अनुभव कम होगा, आपको अधिक सीखने की आवश्यकता होगी।

To a smaller extent; not as much.

कम मात्रा में

English Usage: She smiled less than usual.

Hindi Usage: उसने सामान्य से कम मुस्कुराया।

Used in comparative phrases to denote a lesser quantity or condition.

कम मात्रा में

English Usage: The less said about that issue, the better.

Hindi Usage: उस मुद्दे के बारे में कम कहा जाए, तो बेहतर।