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There are two types of inertia:

1. Inertia of motion: when a ball is rolling on a frictionless floor with constant velocity, it will keep rolling with the same velocity unless an unbalanced external force acts on it.

2. Inertia of rest: Keep a book on a table in rest. The book will be in resting position unless an unbalanced force acts on it.
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Inertia of motion :when a bus is moving very gently as if driver suddenly if driver apply brakes we will fall front. this is inertia of motion
Inertia of rest: when bus is still and if it suddenly starts moving we will fall backwards. this is inertia of rest
inertia of direction is also their .but it not very important
yes I know it also. May I know your class please!!!