Here’s a discussion of impermanence by Gil Fronsdal which does a good job of identifying different ways of understanding and realizing impermanence. This can allow us to begin to let go of some of the clinging that can lead to dissatisfaction in life. You can find that article here: Impermanence.
A monk and a lay follower of the Vietnamese teacher Thich Nhat Hanh have a discussion of impermanence that you may find helpful. You can find their discussion on this podcast: Lessons in Impermanence.