what are stars made of and do they course black-wholes when they explode??

Question: what are stars made of and do they course black-wholes when they explode??
- Keywords:
  black hole,
  star,
  universe
Asked by anon-208407 to Hannah on 5 Mar 2019.
- Hannah Dalgleish answered on 5 Mar 2019:
  
  Stars are made mostly of hydrogen, packed very tightly together in a hot plasma soup. 🥫The biggest stars (much bigger than the Sun) leave behind black holes after they explode.

Question: what are stars made of and do they course black-wholes when they explode??