How do you choose a good password?

How do you choose a good password?

1. Don't use words that can be found in any dictionary of any

language
2. Develop a mnemonic for remembering complex passwords
3. Don't use passwords that are based on personal information that

can be easily accessed or guessed
4. Use both lowercase and capital letters
5 .Use a combination of letters, numbers, and special characters
6. Use different passwords on different systems

How do you choose a good password?