Set a goal. Write it down on paper. Put it at the top or at the center, it doesn’t really matter. Just keep space for other items.
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The required ERTS for your project
MultiVersion Concurrency Control (MVCC) in Mongo: https://www.mongodb.com/docs/manual/core/wiredtiger/#snapshots-and-checkpoints
\[l'_i(x)=(x-x_0)\cdot (x-x_1)\cdots (x-x_{i-1}) \cdot (x-x_{i+1})\cdots (x-x_n)=