Be careful on which site you are on whether it's an exchange or online wallet.

Always check the URL address before typing your username and password.

Example of the scam site

http://myetherwallet.io/

The correct site is: https://www.myetherwallet.com/

How did I get the warning page picture above. I have Metamask installed. Metamask is a dApps where I use it to buy Ethereum ERC20 Tokens ICO's. It also has inbuilt phishing alert so you don't fall for fake websites. Install the chrome plugin from https://metamask.io/.

The people behind Metamask is constantly updating the list of scams.
You can also report fake phishing websites here and check the website below:
https://etherscamdb.info/report/

Total of active scams and counting.

Look out for each other and stay safe out there!