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Wow! not asking much are you..?

Try Googling for 'electronic tuition'

indeed, too much to speak at a time.

learn old tech can know new. all new tech is from old one.

If you really want some help here, then you need to do two things:

1 Do a reasonable amount of research on your own including books, internet, and trade magazines.

2. Ask specific questions.

Your question is so broad it encompasses everything from cordless rechargeable toothbrushes to subspace communications across several parsecs.

As the others have said...

You are asking quesions as a survey, not a topic of interest.

I personally like MEMS best, but this is pretty mutch up there with the latest stuff.