1. You shouldn't download things that are not trustworthy and could give you viruses and malware.
2. You should change your passwords at least once a year to decrease the chances of someone knowing them.
3. Download a trustworthy anti malware app.
4. Don't put your address anywhere online unless your buying something From a trusted site like amazon or eBay.
5. Save your passwords on a paper or a site.
6. Update software frequently because updates can patch vulnerability's that can lead to you being hacked.
7. Don't use open WiFi that you don't know like random free WiFi.
8. Clear your hard drive if you plan on selling a device.
9. Use long and hard to remember passwords.
10. Be suspicious of unknown emails or spam.