Before you start make sure your Apple ID is secured with two factor authentication.
CNET – Two-factor authentication: What you need to know (FAQ)

1. Update the system through the App Store completely.
2. System Preferences -> Security & Privacy:
– General, Set Lock Message (If this laptop has been found, please call #Your-Phone-Number)
– Turn on FileVault
– Turn on FireWall (enable “Automatically signed software to receive incoming connections” and “Enable stealth mode”)
3a. To hide the menu bar, head to System Preferences > General. Next, check the box for Automatically hide and show the menu bar.
3b. System Preferences -> TrackPad and set to your preferred settings
3c. Enable three finger drag gesture OSX Daily – How to Enable the Three Finger Drag Gesture on Mac Trackpads in OS X

4a. Install an AntiVirus scanner, herewith two options:
– Avira Free Antivirus for Mac
– F-Secure Anti-Virus for Mac

4b. Choose your browser and install a tracking cookie filter.
– Firefox: EFF Privacy Badger
– Safari: uBlock

4c. Buy the app Cookie from the App Store, this app removes the cookie and other cache from your browsers.

5. Install a DNS Filter to block suspicious websites and advertisements, K9 Web Protection It was offered for free for many years and as of April 2019 has been removed by Symantec and is no longer available for download.

6. Install f.lux – spare your eyes during late evening screen use.

Last word:
– Install only software from trusted sources to remain secure. Back-doors, Trojan Horses and other viruses are mainly spread through cracks.
– Be always very suspicious before clicking links and opening attachments within your email, even when it seems to be from someone you know and can trust.
– Never install Adobe Flash Player, it adds a major security risk.
– This list has been created with OS X 10.11 (El Capitan)


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