There are plenty of rules telling you what not to do with your passwords:
Never use the default password that comes with a device or an account. Always change it!
Do not use dictionary words in passwords!
Do not use keyboard patterns!
Don’t use the same password in different places!
Don’t store your passwords in or near your computer!
There are lots of “don’ts” here. They are good advice, but what should you do in order to have strong passwords that you can still remember? Some possibilities:
You can use a sentence (that only YOU know) as a guide, picking the first letter of each word: Ycuas(toYk)aag,ptfloew:
You can string four or more words together and substitute several characters, so that there are no dictionary words: mI_Ca7’s-Nam3_izM1ttenz!
You can start with a shorter template, like “Pl3as3’11” and add parts of the web address to it to make a different password for each website: “Pl3as3’11Amaz” for Amazon, “Pl3as3’11Face” for Facebook, etc.
Basically, make your password long, include several numbers and symbols, and make it something you won’t find in a dictionary or phonebook: Mmm…cawff333!