Hi, I have already successfully completed the lab, but I have a couple of questions that couldn’t understand reading the documentation:
What is the difference between $project and $match, $project can be used to “filter”? Or is it just to pass certain values to the next stage?.
I’ve seen aggregation pipelines with expressions and stages written between quotes ("$match", “$or”) and without ($match, $or). There is any difference, or anything I should be aware of?
Thank you very much!