Keep personal information professional and limited.
Do not response to emails or phone calls that requested for your sensitive/confidential information. Take job seeking as example:
Limited information on your professional qualification and experiences.
Personal information like status, address, has to keep private.
Be careful on who you meet online
Hackers like using fake social media accounts to friend with people, and, find chances to get money and sensitive information from them. Set your account higher security level will help to secure yourself being searched and see from strangers.