diff --git a/mini-lsm-book-wip/src/00-overview.md b/mini-lsm-book-wip/src/00-overview.md
index 07dd0c5c..82682220 100644
--- a/mini-lsm-book-wip/src/00-overview.md
+++ b/mini-lsm-book-wip/src/00-overview.md
@@ -1 +1,41 @@
 # Overview
+
+## Structure
+
+chapters + snacks, clear goal
+
+implement, think, try by yourself
+
+required tasks, check your understanding questions, bonus tasks
+
+## Testing
+
+exploring and understanding is more important than passing all the test cases
+
+testing basic requirements, not the internal structure or something
+
+## Solution
+
+### Checkpoints
+
+the final version, but many things can be simplified, read the docs
+
+comments / tests / not up-to-date with the starter code
+
+### How to use the solutions
+
+## Feedbacks
+
+join the Discord server, your feedback is important, thank GitHub users
+
+## License
+
+### Free forever?
+
+### Video lectures + Review Service + Office Hour?
+
+should have a separate preface (before you start) chapter? and what's new with v2?
+
+## Target audience?
+
+## What will you get after taking this course...
diff --git a/mini-lsm-book-wip/src/SUMMARY.md b/mini-lsm-book-wip/src/SUMMARY.md
index 51b8af91..1c41ac26 100644
--- a/mini-lsm-book-wip/src/SUMMARY.md
+++ b/mini-lsm-book-wip/src/SUMMARY.md
@@ -3,9 +3,7 @@
 [Overview](./00-overview.md)
 [Get Started](./00-get-started.md)
 
-# Week 1: Mini-LSM
-
-- [Week 1 Overview](./week1-overview.md)
+- [Week 1: Mini-LSM](./week1-overview.md)
   - [Memtables](./week1-01-memtable.md)
   - [Blocks](./week1-02-block.md)
   - [Sorted String Table (SST)](./week1-03-sst.md)
@@ -14,9 +12,7 @@
   - [Write Path](./week1-06-write-path.md)
   - [Snack Time: SST Optimizations](./week1-07-sst-optimizations.md)
 
-# Week 2: Compaction and Persistence
-
-- [Week 2 Overview](./week2-overview.md)
+- [Week 2: Compaction and Persistence](./week2-overview.md)
   - [Compaction Implementation](./week2-01-compaction.md)
   - [Simple Compaction Strategy](./week2-02-simple.md)
   - [Tiered Compaction Strategy](./week2-03-tiered.md)
@@ -25,9 +21,7 @@
   - [Write-Ahead Log (WAL)](./week2-06-wal.md)
   - [Snack Time: Batch Write](./week2-07-batch-write.md)
 
-# Week 3: MVCC
-
-- [Overview](./week3-overview.md)
+- [Week 3: MVCC](./week3-overview.md)
 
 # The Rest of Your Life (TBD)
 
diff --git a/mini-lsm-book-wip/src/week2-overview.md b/mini-lsm-book-wip/src/week2-overview.md
index 07dd0c5c..ecb6496e 100644
--- a/mini-lsm-book-wip/src/week2-overview.md
+++ b/mini-lsm-book-wip/src/week2-overview.md
@@ -1 +1,8 @@
 # Overview
+
+compaction is important
+
+ask 2 what if questions
+
+LSM is about tradeoffs
+