Take care about your sources - Introduction - a Few clichés - No Virus on mac => bullshit - I got an antivirus, i do my updates => and where does come your cracked photoshop version ? Are you sure it doesn't have a keylogger included Notions - Password: - About password strenght - What to do with passwords - Data / Metadata - What are they (example of letter, metadatas in pictures, cookies - how to take care about metadata - Crypto - How does it work - How to use it (HTTPS, GPG, OTR...) - Internet: - How does it work usually - How does it work with a VPN - How does it work with Tor - Practicaly: take care about intermediates , use https, if possible use tor - About internet: the cloud => Just somebody else computers. - Conclusion: - Antivirus are not enough - have strong passwords - block adds and tracking - encrypt whatever possible - try to use providers you trust - take care about your meta data - it is complicated ? use tails !