read_date.dart

class FireStoreDataBase {
  final CollectionReference collectionRef =
      FirebaseFirestore.instance.collection("Students");

   Future getData() async {
    try {
      //to get data from a single/particular document alone.
      var temp = await collectionRef.doc("<your document ID here>").get(); 
      return temp;
    } catch (e) {
      debugPrint("Error - $e");
      return null;
    }
  }
}