I use an algorithm to have different high security passwords for different websites and still be able to remember them following rules I adopt for every website

I use an algorithm to have different high security passwords for different websites and still be able to remember them following rules I adopt for every website. I mix my username, the website url, a known token and some punctuation. Example: let's say that I need a password for hacker news. - Let's say that I like dolphins, so my chosen token will be Dol - I decide to take the second letter from each word in my username: exa (D e usE x M a china) - I decide to take the third letter from each word in the domain name: wom - I then choose some punctuation to mix in the password: #&% Now I'm ready to assemble my password: Dol#exa&wom% If I have an account on www.yahoo.com with ginger.roger as username, the password would be Dol#io&whm% It's long enough (but I can making it longer, if I want), uses capital letters and special characters (you can also throw in some numbers, this was just an example) and if someone looks into a database the password is not distinguishable from a random one.