How to make a strong password?

Some Internet or computer user passwords using light, example: 123456, or something else of the same. To qenur safer should be a password over 16 characters, example: Axlmp1dulM@4#Iuflpq.
A strong pass word should include: caps, numbers, punctuation marks etc. For a strong password should be more characters, until nowadays it is cracking the password to 16 characters, making password as in the example of the sons-or something else with same increase safety information. Providing information with the term understood a series of protective measures to be taken in order to avoid loss of information or computer processing ability.