diff --git a/docs/example.md b/docs/apps.md
similarity index 72%
rename from docs/example.md
rename to docs/apps.md
index 934daf3..7ca6d11 100644
--- a/docs/example.md
+++ b/docs/apps.md
@@ -1,6 +1,6 @@
 ---
 layout: default
-title: "Example"
+title: "Apps"
 nav_order: 5
 has_children: true
 ---
\ No newline at end of file
diff --git a/docs/essay.md b/docs/essay.md
index cef9baa..8051e59 100644
--- a/docs/essay.md
+++ b/docs/essay.md
@@ -1,8 +1,8 @@
 ---
 layout: default
 title: "Essay"
-parent: "Example"
-nav_order: 1
+parent: "Apps"
+nav_order: 2
 ---
 
 # Summarization + QA agent for Paul Graham Essay
diff --git a/docs/guide.md b/docs/guide.md
new file mode 100644
index 0000000..711f3e9
--- /dev/null
+++ b/docs/guide.md
@@ -0,0 +1,37 @@
+---
+layout: default
+title: "Essay"
+parent: "Apps"
+nav_order: 1
+---
+
+# LLM System Design Guidance
+
+**Use LLMs to help with system design and implementation wherever possible.**
+
+1. **Understand Requirements**  
+   - Clarify the app’s needs and workflow.  
+   - Determine data access (e.g., from files or databases).
+
+2. **High-Level Flow Design**  
+   - Represent the process as a *Nested Directed Graph*.  
+   - Identify possible branching for *Node Action*.  
+   - Identify data-heavy steps for *Batch*.
+
+3. **Shared Memory Structure**  
+   - For small apps, in-memory data is sufficient.  
+   - For larger or persistent needs, use a database.  
+   - Define schemas or data structures and plan how states will be stored and updated.
+
+4. **Implementation**  
+   - Rely on LLMs for coding tasks.  
+   - Start with minimal, straightforward code (e.g., avoid heavy type checking initially).
+
+5. **Optimization**  
+   - *Prompt Engineering:* Provide clear instructions and examples to reduce ambiguity.  
+   - *Task Decomposition:* Break complex tasks into manageable steps.
+
+6. **Reliability**  
+   - *Structured Output:* Verify outputs match the desired format, and increase `max_retries`.
+   - *Test Cases:* Create tests for parts of the flow with clear inputs/outputs.  
+   - *Self-Evaluation:* For unclear areas, add another Node for LLMs to review the results.
diff --git a/docs/index.md b/docs/index.md
index f34e225..7a715b5 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -60,7 +60,9 @@ We model the LLM workflow as a **Nested Directed Graph**:
 - [(Advanced) Multi-Agents](./multi_agent.md)
 - Evaluation
 
-## Example Projects
+## Example LLM Apps
+
+[LLM System Design Guidance](./guide.md)
 
 - [Summarization + QA agent for Paul Graham Essay](./essay.md)
 - More coming soon...