A strong password is your first line of defense against unauthorised access to your account and malacious attacks by cybercriminals. It is imperative you create a strong password and this page provides advice on how you can go about doing that. Treat your password like the way you treat your miswak; only used by you and replaced frequently.
Follow the advice given by Microsoft to help create your password. Click here.
To help you store and remember your password you should seriously consider getting a trusted password manager application. Spend a few minutes reading reviews about password managers and what services they provide before deciding upon one.