diff --git a/README.md b/README.md
index ac356af..7b57744 100644
--- a/README.md
+++ b/README.md
@@ -152,7 +152,7 @@ Courses | Duration | Effort | Prerequisites | Discussion
 [Systematic Program Design](coursepages/spd/README.md) | 13 weeks | 8-10 hours/week | none | chat: [part 1](https://discord.gg/RfqAmGJ) / [part 2](https://discord.gg/kczJzpm)
 [Class-based Program Design](https://course.ccs.neu.edu/cs2510sp22/index.html) | 13 weeks | 5-10 hours/week | Systematic Program Design, High School Math | [chat](https://discord.com/channels/744385009028431943/891411727294562314)
 [Programming Languages](https://courses.cs.washington.edu/courses/cse341/19sp/#lectures) | 11 weeks | 4-8 hours/week | Systematic Program Design | [chat](https://discord.gg/8BkJtXN)
-[Object-Oriented Design](https://course.ccs.neu.edu/cs3500f19/) | 13 weeks | 5-10 hours/week | Class Based Program Design | [chat](https://discord.com/channels/744385009028431943/891412022120579103)
+[Object-Oriented Design](https://course.ccs.neu.edu/cs3500f19/) | 13 weeks | 5-10 hours/week | Class-based Program Design | [chat](https://discord.com/channels/744385009028431943/891412022120579103)
 [Software Architecture](https://www.coursera.org/learn/software-architecture) | 4 weeks | 2-5 hours/week | Object Oriented Design | [chat](https://discord.com/channels/744385009028431943/891412169638432788)
 
 ### Core math
@@ -209,7 +209,7 @@ Courses | Duration | Effort | Prerequisites | Discussion
 Courses | Duration | Effort | Additional Text / Assignments| Prerequisites | Discussion
 :-- | :--: | :--: | :--: | :--: | :--:
 [Build a Modern Computer from First Principles: From Nand to Tetris](https://www.coursera.org/learn/build-a-computer) ([alternative](https://www.nand2tetris.org/)) | 6 weeks | 7-13 hours/week | - | C-like programming language | [chat](https://discord.gg/vxB2DRV)
-[Build a Modern Computer from First Principles: Nand to Tetris Part II ](https://www.coursera.org/learn/nand2tetris2) | 6 weeks | 12-18 hours/week | - | one of [these programming languages](https://user-images.githubusercontent.com/2046800/35426340-f6ce6358-026a-11e8-8bbb-4e95ac36b1d7.png), From Nand to Tetris Part I | [chat](https://discord.gg/AsUXcPu)
+[Build a Modern Computer from First Principles: Nand to Tetris Part II](https://www.coursera.org/learn/nand2tetris2) | 6 weeks | 12-18 hours/week | - | one of [these programming languages](https://user-images.githubusercontent.com/2046800/35426340-f6ce6358-026a-11e8-8bbb-4e95ac36b1d7.png), From Nand to Tetris Part I | [chat](https://discord.gg/AsUXcPu)
 [Operating Systems: Three Easy Pieces](coursepages/ostep/README.md) | 10-12 weeks | 6-10 hours/week | - | Nand to Tetris Part II | [chat](https://discord.gg/wZNgpep)
 [Computer Networking: a Top-Down Approach](http://gaia.cs.umass.edu/kurose_ross/online_lectures.htm)| 8 weeks | 4–12 hours/week | [Wireshark Labs](http://gaia.cs.umass.edu/kurose_ross/wireshark.php) | algebra, probability, basic CS | [chat](https://discord.gg/MJ9YXyV)
 
@@ -253,7 +253,7 @@ Choose **one** of the following:
 
 Courses | Duration | Effort | Prerequisites | Discussion
 :-- | :--: | :--: | :--: | :--:
-[Identifying Security Vulnerabilities in C/C++Programming](https://www.coursera.org/learn/identifying-security-vulnerabilities-c-programming) | 4 weeks | 5 hours/week | - | [chat](https://discord.gg/Vbxce7A)
+[Identifying Security Vulnerabilities in C/C++ Programming](https://www.coursera.org/learn/identifying-security-vulnerabilities-c-programming) | 4 weeks | 5 hours/week | - | [chat](https://discord.gg/Vbxce7A)
 [Exploiting and Securing Vulnerabilities in Java Applications](https://www.coursera.org/learn/exploiting-securing-vulnerabilities-java-applications) | 4 weeks | 5 hours/week | - | [chat](https://discord.gg/QxC22rR)
 
 ### Core applications
@@ -295,7 +295,7 @@ Courses | Duration | Effort | Prerequisites | Discussion
 Courses | Duration | Effort | Prerequisites | Discussion
 :-- | :--: | :--: | :--: | :--:
 [Ethics, Technology and Engineering](https://www.coursera.org/learn/ethics-technology-engineering)| 9 weeks | 2 hours/week | none | [chat](https://discord.gg/6ttjPmzZbe)
-[Introduction to  Intellectual Property](https://www.coursera.org/learn/introduction-intellectual-property)| 4 weeks | 2 hours/week | none | [chat](https://discord.gg/YbuERswpAK)
+[Introduction to Intellectual Property](https://www.coursera.org/learn/introduction-intellectual-property)| 4 weeks | 2 hours/week | none | [chat](https://discord.gg/YbuERswpAK)
 [Data Privacy Fundamentals](https://www.coursera.org/learn/northeastern-data-privacy)| 3 weeks | 3 hours/week | none | [chat](https://discord.gg/64J34ajNBd)
 
 ## Advanced CS