What are the guidelines for password selection?

Related questions

1. What is the best password length?
2. How long will it take to crack a password?
3. How long does it take to crack a 7 character password?
4. How long would it take to crack a 25 character password?
5. Should you use a password generator?
6. Why long passwords are better?
7. What makes for a good password?
8. Is a password manager a good idea?
9. What are the key characteristics of a secure password?
10. Can LastPass see my passwords?

Tags

1. #characters
2. #number
3. #should
4. #letter
5. #passwords
6. #combination
7. #least
8. #symbol
9. #between
10. #lowercase
11. #uppercase