My friend and frocking buddy Kate's website, and endearingly eclectic mix of hints, tips, projects, and links to all sorts of resources. Included are guides to the care and feeding of sewing machines, and what thread to use for your projects.
Kate has been sewing for 40 years, professionally for most of them, and she's forgotton more than I ever knew. Be warned, though, she's a perfectionist!
Rather long, but eyewateringly funny article on the mysteries of tension in sewing machines. Enjoy
How to tell the fire content of a fabric by burn testing it. Not that I'm telling you to play with matches! Really, I'm not telling you to play with matches! But if you must, please make sure you have some means of extinguishing the flame if it gets all out of control, and you are well away from flammable materials like curtains, long hair, etc etc. Hold the fabric to be tested in tongs, not your fingers! I do my burn testing by the kitchen sink, so if something goes up too enthusiastically I can just drop it in the sink and turn the tap on.