What is the difference between inertia and rest?

So an object in motion tends to stay in motion, and an object at rest tends to stay at rest, again unless acted upon by an outside force. Inertia is not a unitary measurement, it has no metric, there is nothing with “more” inertia than another object.
For More Information Please Refer:
https://www.quora.com/Is-inertia-dependent-on-speed
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