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Elders · Oct 1, 2020 · 6144fc9 · 6144fc9
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diff --git a/docs/SUMMARY.md b/docs/SUMMARY.md
@@ -5,8 +5,12 @@
 ## Cronus Framework
 
 * [Domain Modeling](cronus-framework/domain-modeling.md)
-* [Workflows](cronus-framework/workflows.md)
 * [Event Store](cronus-framework/event-store.md)
+* [Workflows](cronus-framework/workflows.md)
+* [Indices](cronus-framework/indices.md)
+* [Jobs](cronus-framework/jobs.md)
+* [Serialization](cronus-framework/serialization.md)
+* [Cluster](cronus-framework/cluster.md)
 * [Messaging](cronus-framework/messaging.md)
 * [Configuration](cronus-framework/configuration.md)
 

diff --git a/docs/cronus-framework/cluster.md b/docs/cronus-framework/cluster.md
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+# Cluster
+
diff --git a/docs/cronus-framework/indices.md b/docs/cronus-framework/indices.md
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+# Indices
+
diff --git a/docs/cronus-framework/jobs.md b/docs/cronus-framework/jobs.md
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+# Jobs
+
diff --git a/docs/cronus-framework/serialization.md b/docs/cronus-framework/serialization.md
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+# Serialization
+
diff --git a/docs/message-handlers/projections.md b/docs/message-handlers/projections.md
@@ -1,2 +1,28 @@
 # Projections
 
+Projection tracks events and project their data for specific purposes.
+
+| Triggered by | Description |
+| :--- | :--- |
+| Event | Domain events represent business changes which have already happened |
+
+## Best Practices
+
+{% hint style="success" %}
+**You can/should/must...**
+
+* a projection **must** be idempotent
+* a projection **must not** issue new commands or events
+{% endhint %}
+
+{% hint style="warning" %}
+**You should not...**
+
+* a projection **should not** query other projections. All the data of a projection must be collected from the Events' data
+* a projection **should not** establish calls to external systems
+{% endhint %}
+
+
+
+
+