How to improve your memory to learn and recall quickly?

When we try to remember something, we believe we need to repeat it. It works a few times and up to a certain extent, and sometimes it’s not practical.
We don’t have an understanding of how memory works. But having good memory can be bad for us, too.
Here’s why it's not good to remember everything. How can you selectively remember for a long time?
As a bonus, you will learn how our memory can help us be positive.