Given the number of passwords, usernames and PINs every Internet user has to remember today, it’s not surprising that people forget their login details. However, for security reasons, it is not recommended to use the same password for all your accounts. In fact, you should change your passwords periodically and make sure they remain secure. This guide explains what to do if you want to change your Gmail password to make your account more secure, or if you need to reset your Gmail password because you forgot it.
Source: https://www.kequery.com/internet/gmail-password-change/