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1. Commits on May 22, 2026

   • Improve Update CRUD section and examples

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   • Improve Delete CRUD section and exercises

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   • Improve Insert CRUD section and exercises

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   • Improve array query examples and explanations

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   • Added summary

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   • Improve Sort & Limit section with clearer explanations and examples

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   • renaming project sort file

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   • renaming find file

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   • Updating mongodb and slj4 version

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2. Commits on May 14, 2026

   • Added summary at the bottom of the page

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   • adding links to the documentation and remove unnecessary code.

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   • refactor: standardize aggregation notebook descriptions and add $set examples

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3. Commits on May 13, 2026

   • Adjusting the order of the pipelines

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   • Adding correct format to follow a pattern.

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   • adjusting link

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   • added index name to console log.

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   • Added a new file for explain method that is covered during skill badge

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   • Fix url

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   • Changing the solution link

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   • Included limit import

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4. Commits on May 12, 2026

   • Adjusting code.

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   • add unwind challenge and include placeholder for arrays

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5. Commits on May 8, 2026

   • refactor: improve group challenges and add clearer aggregation hints

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   • refactor: improve group example wording and formatting

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   • refactor: improve lookup challenge scaffolding and notebook guidance

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   • Including books collection

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   • refactor: improve unwind example readability and projection style

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   • refactor: improve array aggregation examples and explanatory notes

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   • Including simple comments

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   • refactor: simplify challenge boilerplate so learners can focus on pipeline stages

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   • refactor: improve aggregation sort example and description

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   • refactor: simplify aggregation limit examples and improve descriptions

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   • Add dedicated $project aggregation example and explanation

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   • Add $limit and $project aggregation example

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   • Simplify $match aggregation example using exact title filter

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