What does the aggregate $project operation do$?$ Provide at least one example.

Provide an example of when the $project operation could be used.

What does the aggregate $match operation do$?$ Provide at least one example.

Provide an example of when the $match operation could be used.

What does the $sort operation do$?$ Provide at least one example.

Provide an example of when the $sort operation could be used.