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.?
As @Garrett said, there are a lot of beginner electronics websites out there. My favorites are:
- http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html -> Electricity and Magnetism
- Circuits and Electronics (6.002x) - free online electronics course from MIT
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!