Refactor E and S

WEEK01/WEEK01-03.md

@@ -1,10 +1,10 @@
-# Embedded Systems Reverse Engineering
+# Embedded Systems Reverse Engineering
 [Repository](https://github.com/mytechnotalent/Embedded-Hacking)
 
 ## Week 1
 Introduction and Overview of Embedded Reverse Engineering: Ethics, Scoping, and Basic Concepts
 
-### Exercise 3: Find Cross-References in Ghidra
+### Non-Credit Practice Exercise 3: Find Cross-References in Ghidra
 
 #### Objective
 Learn how to use Ghidra's cross-reference feature to trace how data flows through code, understanding where specific data is read, written, or referenced.
@@ -25,17 +25,17 @@ In this exercise, you'll:
 #### Background: What are Cross-References?
 
 A **cross-reference** is a link between different parts of the code:
-- **Code → Data**: An instruction reads or writes data
-- **Code → Code**: A function calls another function
-- **Data → Data**: One data item references another
+- **Code ? Data**: An instruction reads or writes data
+- **Code ? Code**: A function calls another function
+- **Data ? Data**: One data item references another
 
-In this exercise, we're tracking **code → data** references to understand where and how the program uses the "hello, world" string.
+In this exercise, we're tracking **code ? data** references to understand where and how the program uses the "hello, world" string.
 
 #### Step-by-Step Instructions
 
 ##### Step 1: Navigate to the main Function
 
-1. In Ghidra's CodeBrowser, use **Search → For Address or Label** (or press **Ctrl+G**)
+1. In Ghidra's CodeBrowser, use **Search ? For Address or Label** (or press **Ctrl+G**)
 2. Type `main` and press Enter
 3. Ghidra will navigate to the `main` function
 4. You should see the disassembly in the Listing view (center panel)
@@ -167,7 +167,7 @@ Read backwards: `10 00 19 CC` = `0x100019CC`
 #### Tips and Hints
 
 - If you right-click and don't see "References", try right-clicking directly on the instruction address instead
-- You can also use **Search → For Cross References** from the menu for a more advanced search
+- You can also use **Search ? For Cross References** from the menu for a more advanced search
 - In the Decompile view (right side), cross-references may be shown in a different format or with different colors
 - Multi-level references: You can right-click on a data item and then follow the chain to another data item
 
@@ -193,12 +193,12 @@ By completing this exercise, you've learned:
 You should now understand this flow:
 ```
 String "hello, world" is stored at address 0x100019CC in Flash
-    ↓
+    ?
 A pointer to this address is stored at DAT_10000244 in Flash
-    ↓
+    ?
 The main() function loads this pointer: ldr r0, [DAT_10000244]
-    ↓
+    ?
 main() calls printf with r0 (the string address) as the argument
-    ↓
+    ?
 printf() reads the bytes at that address and prints them
 ```