Add "Avoid sharing passwords" tip

README.md

@@ -43,6 +43,7 @@ Use long, strong and unique passwords, manage them in a secure password manager,
 **Use a Strong Password** | Recommended | If your password is too short, or contains dictionary words, places or names- then it can be easily cracked through brute force, or guessed by someone. The easiest way to make a strong password, is by making it long (12+ characters)- consider using a 'passphrase', made up of many words. Alternatively, use a password generator to create a long, strong random password. Have a play with [HowSecureIsMyPassword.net](https://howsecureismypassword.net), to get an idea of how quickly common passwords can be cracked. Read more about creating strong passwords: [securityinabox.org](https://securityinabox.org/en/passwords/passwords-and-2fa/)
 **Don't reuse Passwords** | Recommended | If someone was to reuse a password, and one site they had an account with suffered a leak, then a criminal could easily gain unauthorized access to their other accounts. This is usually done through large-scale automated login requests, and it is called Credential Stuffing. Unfortunately this is all too common, but it's simple to protect against- use a different password for each of your online accounts
 **Use a Secure Password Manager** | Recommended | For most people it is going to be near-impossible to remember hundreds of strong and unique passwords. A password manager is an application that generates, stores and auto-fills your login credentials for you. All your passwords will be encrypted against 1 master passwords (which you must remember, and it should be very strong). Most password managers have browser extensions and mobile apps, so whatever device you are on, your passwords can be auto-filled. A good all-rounder is [BitWarden](https://bitwarden.com), or see [Recommended Password Managers](/5_Privacy_Respecting_Software.md#password-managers)
+**Avoid sharing passwords** | Recommended | While there may be times that you need to share access to an account with another person, you should generally avoid doing this because it makes it easier for the account to become compromised. If you absolutely do need to share a password for example when working on a team with a shared account this should be done via features built into a password manager.
 **Enable 2-Factor Authentication** | Recommended | 2FA is where you must provide both something you know (a password) and something you have (such as a code on your phone) to log in. This means that if anyone has got your password (e.g. through phishing, malware or a data breach), they will no be able to log into your account. It's easy to get started, download [an authenticator app](/5_Privacy_Respecting_Software.md#2-factor-authentication) onto your phone, and then go to your account security settings and follow the steps to enable 2FA. Next time you log in on a new device, you will be prompted for the code that displays in the app on your phone (it works without internet, and the code usually changes every 30-seconds)
 **Keep Backup Codes Safe** | Recommended | When you enable multi-factor authentication, you will usually be given several codes that you can use if your 2FA method is lost, broken or unavailable. Keep these codes somewhere safe to prevent loss or unauthorised access. You should store these on paper or in a safe place on disk (e.g. in offline storage or in an encrypted file/drive). Don't store these in your Password Manager as 2FA sources and passwords and should be kept separately.
 **Sign up for Breach Alerts** | Optional | After a website suffers a significant data breach, the leaked data often ends up on the internet. There are several websites that collect these leaked records, and allow you to search your email address to check if you are in any of their lists. [Firefox Monitor](https://monitor.firefox.com), [Have i been pwned](https://haveibeenpwned.com) and [DeHashed](https://dehashed.com) allow you to sign up for monitoring, where they will notify you if your email address appears in any new data sets. It is useful to know as soon as possible when this happens, so that you can change your passwords for the affected accounts. Have i been pwned also has domain-wide notification, where you can receive alerts if any email addresses under your entire domain appear (useful if you use aliases for [anonymous forwarding](/5_Privacy_Respecting_Software.md#anonymous-mail-forwarding))