Some commonly used passwords are your name with a number at the end, your child's name followed by their date of birth, or something simple like 'Password123'.
Click Here for a list of commonly used passwords
My suggestion for a password that is very difficult to hack but easy for you to remember is a string of unrelated words with a symbol and number mixed in.
Even more secure is a random sentence:
Click Here for an article on creating the perfect password
Choose a combination that you can easily remember but hard to crack.
Also take advantage of two step authentication, here is a quick video on Google's two step security: