I recently learned about inertia that it is a property by virtue of which body resists change in it's motion.
I want to know what does "resistance to change in motion" actually implies?
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It just means
$$\mathbf a=\frac{\mathbf F}{m},$$
which is another way of writing Newton’s Second Law.
Mass ($m$) is the quantitative measure of “inertia”. Acceleration ($\mathbf a$) is the quantitative measure of “change in motion”. The more mass an object has, the less acceleration is caused by a given force ($\mathbf F$). Greater mass makes it more difficult for something to change its velocity.
