It is easier to remember just one password than a lot of them. But there is a dark side as well, if someone gets to know the password from one of your acconts, they can use all of your other accounts as well.
Use the same rule for making different passwords. For example, you can use names of your family members and pets and add to them a year when they would be 20 years old. If your daugter's name is Angela and she will be 20 in 2021, the password will be Angela2021. Make the same with your partner's name, your pets' names, etc., so you will have several different passwords, but you won't need to remember them all, just remember how you made them up.
This way you will use 3 perception channels at once: you will write it, you will read it and you will say it. Don't forget to be concentrated as well, it will give you more chances to remember the information.
Any information needs some time of your focused attention to be remembered. So just don't hurry and be concentrated on things and actions that you need to remember. It works for everything: for names and faces of people, for new words, for where you put your keys when you come home, for remembering that you turned off the gas before leaving, etc.
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