Basic quantities are the primary measurements that stand on their own. They are the building blocks for all other measurements in physics. Here are the seven basic quantities defined by the International System of Units (SI):

1. Length (Meter, m)

2. Mass (Kilogram, kg)

3. Time (Second, s)

4. Electric Current (Ampere, A)

5. Temperature (Kelvin, K)

6. Amount of Substance (Mole, mol)

7. Luminous Intensity (Candela, cd)

These quantities are independent and do not rely on other measurements.

Example: Measuring Length

Think about measuring the length of your desk. If it’s 1.5 meters long, you are using the basic quantity of length, measured in meters (m).

Knowing the difference between basic and derived quantities helps you understand and solve various problems in physics. Once you know the basic quantities and how to combine them to get derived quantities, you can analyze and solve many different kinds of physical problems. 

In summary, basic quantities are the simple, primary measurements in physics, while derived quantities are combinations of these basics. By understanding and using the formulas for these quantities, you can solve many physics problems easily.

Keep practicing with different examples, and soon these concepts will become second nature. Happy studying!