Theorie:

Study the information about the definite article and the zero article.
 
Wichtig!
We do not use the for general ideas.
 
Life is not possible without water.
  
There are some situations when we use the zero article.
 
1. proper nouns.
 
Kate comes from Spain.
  
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2. names of sports, activities, colours, substances, meals.
 
Football is my favourite sport.
  
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3. names of countries, cities, streets, parks, mountains, islands, lakes, continents.
 
My friend likes walking in Hyde Park.
  
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4. the possessive case or possessive adjective.
 
This is not your coat, it's Sarah's.
  
5. titles with proper names.
 
President Kennedy was very popular among American people.
  
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Quellen:
www.millenniumhotels.co.uk
en.wikipedia.org
www.ciee.org
www.theguardian.com