Swapped Core security and Core applications links in the curriculum index to reflect the order of the page. Added a link for Core ethics to the index. Updated some capitalization.

README.md

@@ -93,8 +93,9 @@ just remember that you can't purchase success!
   - [CS Tools](#cs-tools)
   - [Core systems](#core-systems)
   - [Core theory](#core-theory)
-  - [Core applications](#core-applications)
   - [Core security](#core-security)
+  - [Core applications](#core-applications)
+  - [Core ethics](#core-ethics) 
 - [Advanced CS](#advanced-cs)
   - [Advanced programming](#advanced-programming)
   - [Advanced systems](#advanced-systems)
@@ -171,7 +172,7 @@ Courses | Duration | Effort | Prerequisites | Discussion
 [Design Patterns](https://www.coursera.org/learn/design-patterns) | 4 weeks | 4 hours/week | Object-Oriented Design
 [Software Architecture](https://www.coursera.org/learn/software-architecture) | 4 weeks | 2-5 hours/week | Design Patterns
 
-### Core Math
+### Core math
 Discrete math (Math for CS) is a prerequisite and closely related to the study of algorithms and data structures. Calculus both prepares students for discrete math and helps students develop mathematical maturity.
 
 **Topics covered**:
@@ -251,7 +252,7 @@ Courses | Duration | Effort | Prerequisites | Discussion
 [Greedy Algorithms, Minimum Spanning Trees, and Dynamic Programming](https://www.coursera.org/learn/algorithms-greedy) | 4 weeks | 4-8 hours/week | Graph Search, Shortest Paths, and Data Structures | [chat](https://discord.gg/dWVvjuz)
 [Shortest Paths Revisited, NP-Complete Problems and What To Do About Them](https://www.coursera.org/learn/algorithms-npcomplete) | 4 weeks | 4-8 hours/week | Greedy Algorithms, Minimum Spanning Trees, and Dynamic Programming | [chat](https://discord.gg/dYuY78u)
 
-### Core Security
+### Core security
 **Topics covered**
 `Confidentiality, Integrity, Availability`
 `Secure Design`
@@ -302,7 +303,7 @@ Courses | Duration | Effort | Prerequisites | Discussion
 [Computer Graphics](https://www.edx.org/course/computer-graphics-2)| 6 weeks | 12 hours/week | C++ or Java, linear algebra | [chat](https://discord.gg/68WqMNV)
 [Software Engineering: Introduction](https://www.edx.org/course/software-engineering-introduction) | 6 weeks | 8-10 hours/week | Core Programming, and a [sizable project](FAQ.md#why-require-experience-with-a-sizable-project-before-the-Software-Engineering-courses) | [chat](https://discord.gg/5Qtcwtz)
 
-### Core Ethics
+### Core ethics
 
 **Topics covered**:
 `Social Context`