Looking for Aggregate example with Projection

Working with Data
1

I am using $lookup to join another collection and would like to use projection to limit the fields returned from the joined collection.

Any examples would be appreciated.

2

Plenty of examples in

M121 from MongoDB University is great to have a good starting understanding.

3

Thanks but none of those examples use $lookup and $project together. I was able to piece together a working aggregate from some random examples here on the boards.