• 8**-1: What is aggregation? Why it is powerful?**
• 8**-2: Explore $match aggregate operator**
• 8**-3: Explore $addFields stage**
• 8**-4: Explore $group**
• 8**-5: Explore $group more, accumulator, $sort, $limit**
• 8**-6: Explore Accumulate Operator using aggregation**
• 8**-7: Explore $unwind**
• 8**-8: Explore the powerful Multi-stage pipeline**
• 8**-9: Explore the $lookup operator**
• 8**-10: Fix_id $lookup issue, overview of populate methodsX**