[BwanaNdege]

https://www.khanacademy.org/

Plus, just search YouTube for various “industrial/shop”. topics.

Or the various technical hobbies.

The internet can be a fabulous learning tool. I had a request this week from a doctor in Ethiopia. Sugar was rationed in her location and she needed a replacement for Oral Rehydration Solution. She mentioned hearing about a rice based substitute while at a tropical medicine course in Bangkok.

Two minutes on Google and voila! The actual research paper telling the formulation, method of making, nutritional composition and the results of clinical trials... and all in English, to boot!

[AnotherUnixGeek]

https://www.khanacademy.org/

The success and popularity of the Khan Academy are testimony to just how bad the quality of teachers at many public high schools is. The Khan instructional videos on Algebra, Geometry, Trig are clear, explained well and easy to understand - by contrast, many high school teachers of these subjects barely understand them and often confuse and frustrate their students in their attempts to teach these subjects. Of course, there's no substitute for adequate, stringent testing at school but the Khan Academy is a high-quality, free online tutor for any student struggling with high school math (and other subjects too). One of the most worthwhile uses of the Internet I've seen.