When are memory leaks important? What are the easiest ways to avoid memory leak?

Memory Leaks:

Memory leaks take up more memory space and causes slow calculation. 
Ensure that the loops or conditional statements are executed completely to prevent memory leak occurrence.

The best and easiest way to avoid memory leaks is to make changes at the time of writing programs. The cause for this is, a properly planned program can avoid memory leaks. In addition to it, make a code snippet can be made simple, small which executes fast..