I had the luck to have someone who could explain everything to me, but most starting hobbyists don't have someone like that. Is there a guide available which covers all the basics, like formulas, parallel / series, etc.?

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    \$\begingroup\$ sound.westhost.com/articles.htm \$\endgroup\$ – shimofuri Jan 7 '13 at 13:43
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    \$\begingroup\$ Uhm, how about this stack exchange? :) If the question is good, it's still useful even if basic. As the "about" page say: "This is a free, community driven Q&A for electronics and electrical engineering professionals, students, and enthusiasts. " \$\endgroup\$ – Trygve Laugstøl Jan 8 '13 at 13:03
  • \$\begingroup\$ A random smattering of questions and answers with all difficulty levels mixed in is hardly a useful narrative. Its nice if you have something specific to ask, but not so useful if you want learn the basics with no large gaps. \$\endgroup\$ – travisbartley Jul 1 '13 at 2:43

There are a ton of websites and tutorials, I got started from books, and we have a good list here as for a site, Electronics Theory has a good free course that starts very basic and very detailed.

Another site that has a lot of video and stuff is 101 Science.

For a bit more advanced user (not much more, but it isn't an intro into electronics,) Electronics Lab has a lot of projects and stuff, they even sell kits, and they buy designs and tutorials if you feel like writing one, I've done it years ago. And EEV Blog is a great source for the more advanced person, great very popular videos! Highly recommended, and they have a forum too!