Theory:

Elements are classified into three categories based on their properties.
  
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Metal:
Metal is a solid substance that is generally hard and shiny.
Some common metals:
 
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Iron, copper, gold and silver
 
Non-metals:
The element that generally does not shine, neither too hard nor too soft, is called non-metal. All gases are non-metals.
Some common Non-metals:
 
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Carbon
 
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Sulphur
 
Metalloids or Semi-metals:
The chemical elements that exhibit the properties of metals and non-metals are called metalloids.
Reference:
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https://cdn.pixabay.com/photo/2017/03/25/20/25/teapot-2174333__340.jpg
https://cdn.pixabay.com/photo/2017/03/25/20/25/teapot-2174333__340.jpg
https://upload.wikimedia.org/wikipedia/commons/3/39/Sulphur-38197.jpg