We often find remembering password difficult.
For online services, we recommend choosing a word, a couple of numbers and another short word, for example yellow45brighton, or it could be something that you really like and find easy to remember, for example chocolate buttons.
You might want to think about using a different password than your usual password. Sometimes other people can know your password.
If you write your password down, remember to keep it in a safe place.
Here is a useful article about creating passwords you can remember.