Generally-accepted password security standards have changed quite a bit over the years. Previously, users were advised to create passwords with a variety of letters, numbers, and symbols.
Later, a certain popular XKCD comic seemed to suggest a different type of password, composed of four unrelated words, would be a better alternative.
Even that isn’t enough in modern times, though. Now, two-factor authentication and password managers are the norms. The former adds an additional layer of security while the latter removes the need to remember your passwords across different websites.