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Where can I find a tutorial about µcontrollers?

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Recently I was in a forum and aske a straight question like the above one. Somebody answered "This forum does not owe you any answer". So I...

Thanks for the useful inforamtion. Since it is my first time, I need the simplest µcontroller for this purpose. Even if it doesn't have a clock. Simplicity is in the first priority. Now I am going to...

Can anybody introduce me a µcontroller for a simple robot? This robot should:
-Move by wheel, so µcontroller should control its wheels and movements.
-Sense light and decide what to do. For example...