Much like anything, learning effectively on the Web requires a skill set that goes beyond constructing a solid keyword search in Google (although that is a great start). Knowing your learning style lays the foundation for not only the types of information that you should seek out, but also for how you capture and record it for future use.
There are myriad wonderful online tools for note-taking, bookmarking, keeping up with information and organizing tasks and time. Which you choose depends on how well they fit the way you think and your work style.
Being on the Web is about being part of a larger community that stretches throughout the world. Take advantage of the huge resource that is the people on the Web by connecting with them as your peers, mentors, and reflections of your future self. However, remember as well to give something of yourself—be it advice, techniques, or a website of your own.
Finally, actively feed your brain with inspiration away from the Web. Give yourself the opportunity to take magical pieces of the world around you and weave them into your own unique vision.