This "7. Create Multiple User Account To Protect Privacy
If you own an Android tablet and have to share it with a sibling, a spouse, or your kids, having multiple user accounts will help each of you protect your privacy." is kind of no-brainer, but with multiple users you (the owner) also would do well to heed "3. Lock Your Apps
It is necessary to lock your apps, especially the ones holding private information that you wish nobody but you could see." I'm using App Lock, not bad but it's necessary to tweak the settings a bit to keep it becoming a nuisance.