Password strategy 101 to remember unlimited number of different password:
1- Separate each site/service into 1 of 3 categories:
a- Official things you can't afford to be hacked
b- Things you'd be pissed to be hacked
c- Things you don't care to be hacked
2- Select a pattern with good security principles. You need numbers (N), upper (U) and lower (L) case letters and at least 1 symbol (S). A good pattern would be LNUUNLLS
3- Select numbers for each category defined at #1. For example, #1 could be 257, #2 could be 368 and #3 could be 479.
How it all comes together?
Say you visit NewEgg.com and we consider this a "B" type of site (pissed, but not catastrophic). You take the first 5 letters of the site and apply the pattern in #2 to get n3EW6eg!
Say you visit EA.COM (category -> not important), you get e4AC7om!
That way, you don't have to remember any password, you only have to remember your pattern. With this method, you can literally log into an unlimited number of sites/services without ever forgetting your password ever again. The best thing is, even if the site or service is compromised, you don't have the same password anywhere else. There's no way an hacker will take the time to find your password pattern so you can practically say you're 100% secure too.