Worth mentioning a couple of important security practices:
- DON'T REUSE PASSWORDS for different services, otherwise if www.sarahsmuffins.com.au gets hacked because Sarah doesn't know much about security then the bad guys will get access to all your accounts on the entire internet. Consider a password manager like LastPass or RoboForm.
- Don't just click on links in emails, at least hover first to see where the link goes, if its an email from Telstra and the link is to www.getyourvirushere.com then don't click. If you are unsure just don't click it at all. Phone or email the sender from a new clean email seeking more details.