I like to add a simple hash value based on the URL onto my passwords. A simple hash that you can calculate in your head is best, such as the first four consonan

I like to add a simple hash value based on the URL onto my passwords. A simple hash that you can calculate in your head is best, such as the first four consonants of the URL, and then you can integrate that into a password by just concatenating them or splicing them together somehow. That way, all your passwords are different in a manner that is not immediately obvious, but there is no significant additional burden on your memory.