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What is the capital of France?

db.world.findOne({name:"France"},{capital:1})

Learn NoSQL using: MongoDB

Tutorials: Learn NoSQL in stages

1 Find Tutorial
Using Find.
2 AGGREGATE Tutorial
In which we query the world collection and make use of aggregate functions. AGGREGATE Movies Tutorial
3 MAPREDUCE tutorial
Using MapReduce.
4 MAPREDUCE elite
MapReduce questions using the Elite Dangerous dataset.

Reference: How to...

AGGREGATE examples
FIND
FIND examples
MAPREDUCE
NOSQLZOO: 'elite' dataset schema
RegEx Pattern Matching

MongoDB resources

Manuals
MongoDB Documentaion MongoDB Documentation GitHub
Python 3 Documentation PyMongo API Documentation
Karl Seguin's The Little MongoDB Book