corporate web security

so you have email and password
you have computer log in and password
hours entry system and password
banks and password
credit cards and password
personal emails and password
in all these to increase security there are more and more stuff to remember
so i have used a base password and variation of that
then there are systems that require one capital and lower case with numerals and special characters

does this increase security or most likely people like me are going to use same password and srore it in a file conveniently called pass words