Here are some simple ways you can increase your data security against miscreants or intruders.
Close open sessions
When you're finished with the device, log out of services such as Facebook or other sites.
This helps keep an evildoer from reopening the windows and having access to your account.
Clean browser and other cache
Clear all your history, passwords, and cookies from the browser you used.
Don't assume this is the default behavior on logout. Depending on the platform,
check caches as well. You can delete the ~/.cache folder if you're on a modern Linux system.
Empty the trash
Remove any items left behind on the desktop,
if applicable, and empty the account's Trash or Recycle Bin.
Use service security options
Enable login notifications or approvals for your services and accounts.
Some services have an option that notifies you when someone logs into your account
from a new device or location. You'll also get a notice when you login legitimately.
But it's helpful to know if someone tries to use your login unexpectedly
from another computer or location.Other services may allow you to approve any
login activity via an email notice. Access is only granted
if you approve via a link in the email you receive.
Check your services to see if they offer either of these security options.
Limit sensitive data
The easiest way to keep data safe on a computer you don't own is not to process
it to begin with. Try to avoid or limit work that needs sensitive information.
For example, you might not want to access bank or credit card accounts,
or secure systems for your workplace.