I think you may be getting confused with addresses and passwords.
Making your password more secure by using a combination of uppercase letters and lowercase and numbers and special characters will make you safer.
most secure passwords would be a random set of the above, such as Dyz#1FpQ9$ (the longer the better) but this is obviously hard to remember.
The next best bet is two totally unconnected words also using a combination of upper and lower case such as BaNanatoilEt (you can make it even more secure by adding a special character or two, such as BaNana$toilEt%)