A weak network security key can expose your network to a variety of security risks. If a hacker is able to guess your password or use an automated tool to crack it, they could potentially steal your data and use it for identity theft or to distribute malware to devices connected on the network.
You can help keep your network secure by choosing a long password. This should be at least 12 characters. It should also be a random string of letters (upper and lower case), numbers, and special characters. A secure password doesn’t include any personal information such as a person’s (or pet’s!) name or date of birth.
You can always use a password generator to help. Finally, the network security key you use should be unique — it’s not good security practice to use the same password across multiple networks because if one becomes compromised, they’re all then at risk.