coll
    .find({"field1": "v1", ...}, {f1: 1, f2: 0}) // 2-nd - projection
        .pretty()
        .sort({keyfield: 1/-1, ...})
            https://www.studytonight.com/mongodb/sorting-in-mongodb
        skip(N).limit(M)
        https://www.tutorialsteacher.com/mongodb/cursor
        !!! cursor


operators
    {$gt: 75}
    { $gte: new ISODate( "2020-01-30" ), $lt: new ISODate( "2022-01-30" ) }
    field: {"$exists": false}

???
 cur = db.world.find();x=cur.next();print(x["speech"]);