By: Raymond Hackney
The first three from the article:
Here are 10 important links that every Google user should know about. They are tucked away, somewhere deep inside your Google dashboard.
1. Create a new Google Account using your existing email address. The regular sign-up process uses your @gmail.com address as your Google account username but with this special URL, you can use any other email address as your username.
2. Google creates a profile of yourself based on the sites you visit, your Google+ account and other signals. They try to guess your age, gender and interests and then use this data to serve you more relevant ads. Use this URL to know how Google sees you on the web.
3. Google lets you export all your data out of the Google ecosystem. You can download your photos, contacts, Gmail messages and even your YouTube videos. Head over the the Takeout page to grab the download links.
Read the whole list of 10 here