Guitar tutorials

https://www.guitarlessons.com/guitar-lessons/beginner-guitar-quick-start-series

https://www.guitartricks.com/

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Violin/ Cello tutorials

https://fiddlerman.com/tutorials/beginners-tutorials/

http://stringslessons.com/

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Otamatone Tutorials

https://theirishb.wixsite.com/otamatone/practice

https://www.youtube.com/watch?v=iNqFz0bP-eY

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Theremin tutorials

http://www.synthtopia.com/content/2012/11/18/theremin-tutorial-for-beginners/

http://www.thereminworld.com/Article/15076/6-tips-for-learning-to-play-your-new-theremin

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Triangle tutorials

https://www.youtube.com/watch?v=_Zgk9mBUKVQ