I’ve already tried that approach.
“Password” seemed to work well, but sites are now requiring upper case, numerals, etc. Which messed up my system.
Our company (huge) suggest our passwords be our first/last initials + birthdate (mo/yr) + last two digits of SSN, with the letter of our last name capitalized. This passes most password tests as ‘strong’. If someone makes you change your password, just make a onomonapoeia (sp) of this password, i.e., spell it backwords.
Cap the first letter of your word and follow it with a number
If they torture me I'll give it up in a heartbeat.
That's why I use "Pa$$w0rd". No one could guess, and it meets all the security requirements.
Another option is some variant of "TrOtPtKaBaSnBi" (the right of the people . . . shall not be infringed) with perhaps a 1 for the I or a 0 for the O, with as someone said an _sitename at the end. I don't use a password manager because I don't like putting all my passwords in one place (except here on FR where they are completely secure, of course!).