Harden your password: Take a moment and try to guess the most popular password currently in use. If you said “password,” you wouldn’t be far off. In SplashData’s annual list of the most commonly used passwords, “password” ranks No. 2. “123456” ranks No. 1. Those aren't passwords, they're wet cardboard.
If you don’t want someone breaking into your data, you have to put a firm lock on the door. Hard passwords include a mix of upper- and lowercase letters, digits and special characters. They should be at least eight characters in length and they should definitely not spell out words like your pet’s name or your high school mascot. If you do nothing else suggested here, harden your password.
Change it up: A second and very common mistake made by users is to create one hard password, but then never change it or use it across a variety of accounts.
To be sure, managing an ever-changing list of complicated passwords is a pain. But ultimately no password is unbreakable, and using them across accounts is an invitation for a catastrophic hack. If you’re having trouble keeping track of all those hard passwords (do not write them down), there are a variety of password managing services and ideas out there that are relatively easy and secure.
Clear that cache: This goes for all the devices you use in a day -- your home computer, your work computer, your friend’s iPad, etc. Every time you use a browser like Firefox or Chrome, it keeps track of where you’ve been and what you’ve done. Often by default, records of every site you visited and all your uploads and downloads can be kept for days or even weeks.
It’s very easy for anyone else to view that cache and steal a detailed record of your online activities. Thankfully, it’s even easier to clear your cache once you’re done or set your preferences to not record any of your activities.
Don’t use free Wi-Fi: The old adage “there’s no free lunch” was rarely truer than when it comes to Wi-Fi. Increasing numbers of cafes, bars, stores or other public places are offering data-hungry mobile users free wireless access to the Internet, often even without passwords. These services might be convenient, but they’re also an open door to everything on your device. Unless you really need it, don’t use it.