The Internet is a wealth of information on the Raspberry Pi, some more reliable than others. Here are some extremely useful and reliable sites — ones you’ll want to check regularly:
Adafruit: The legendary Limor Fried’s company offerings for the Raspberry Pi. Named after Ada Lovelace, a collaborator with Charles Babbage and all-around mathematical genius.
Baking Pi – Operating Systems Development: Direct from the University of Cambridge’s Computing Laboratory comes a comprehensive set of tutorials. The site also contains lots of interesting links to other places.
element14 Community: This is the community space of major distributor Farnell/Newark Electronics. It offers news, competitions, tutorials, help, and advice. The standard of advice is excellent — this is not a blind-leading-the-blind website.
Hackaday: The skull-and-crossbones logo gives you a hint that this is a hard-core hacking site. It isn’t always the most sympathetic site for the Raspberry Pi because the Pi is aimed at beginners, but even Hackaday users acknowledge the genius things that people do with the Pi.
The MagPi: A great free online monthly magazine on the Raspberry Pi. It contains articles ranging from beginner to advanced, and back issues are available for free download.
Mike Cook: This is the website of Mike Cook. Here, Mike offers interesting Raspberry Pi stuff and tutorials about electronics.
The Pi Store: Here you can download the free Educational User Manual for use in your home or school.
Raspberry Pi Blog: The official blog of the Raspberry Pi Foundation. You always get the news here first, along with outstanding projects, videos, and educational activities.
The Raspberry Pi Guy: Matt Timmons-Brown is a young guy who produces great video tutorials on most aspects of the Raspberry Pi. This is his site.
RasPi.tv: On this YouTube channel, Alex Eames talks about the Raspberry Pi, as well as programming, electronics, and physical computing.