How can you secure a user account against unauthorized access?

Using strong passwords and two-factor authentication is a highly effective method for securing a user account against unauthorized access. Strong passwords are complex and difficult to guess, typically combining letters, numbers, and symbols, which make it significantly harder for attackers to gain access through credential guessing or brute force attacks. Two-factor authentication adds an extra layer of security by requiring not just the password, but also a second piece of information, typically a code sent to the user's mobile device or email. This means that even if a password is compromised, unauthorized users would still face a barrier to access due to the requirement of the second factor.

In contrast, enabling guest login may actually open up an account to unauthorized users, as it allows others to access the system without proper validation. Limiting account access to weekdays does not effectively protect against unauthorized access outside those days or provide any real security for accounts themselves. Sharing passwords with trusted users can compromise account integrity, particularly if those users are not diligent about safeguarding their access credentials. Therefore, the combination of strong passwords and two-factor authentication remains the best practice for enhancing account security.