Pick a strong password. Use a combination of at least eight characters, letters, numbers, and special characters (like ! and @). It should be different from other passwords you use elsewhere on the internet.
Change your password regularly to keep your account secure.
Never give your password to someone you don't know and trust.
Make sure your email account is secure. If someone breaches your email account, then they can probably also access your Terraview account. Change the passwords for all of your email accounts and make sure that no two are the same.
Log out of Terraview and close the browser when you use a computer you share with other people.
Don't check the "Remember Me" box when logging in from a public computer, as this will keep you logged in even after you close the browser window.