misc: fix redirects

contents/behavioral-questions.md

@@ -0,0 +1,5 @@
+# Behavioral questions
+
+[Contents have been moved to the website. Click here.](https://www.techinterviewhandbook.org/behavioral-interview-questions/).
+
+<!-- TODO: Remove in future -->

design/README.md

@@ -1,5 +1,5 @@
 # System Design
 
-## Specific topics
+[Contents have been moved to the website. Click here.](https://www.techinterviewhandbook.org/system-design/).
 
-The contents have been moved to a different [location](../experimental/design#specific-topics).
+<!-- TODO: Remove in future -->

experimental/design/README.md

@@ -1,8 +1,14 @@
 # Design Questions
 
+## Quality courses
+
+- ["Grokking the System Design Interview" on Educative](https://www.educative.io/courses/grokking-the-system-design-interview?aff=x23W) - This is probably the most famous system design interview course on the internet and what makes it different from most other courses out there is that it is purely text-based, which is great for people who refer reading over watching videos (such as myself!). It contains a repository of the popular system design problems along with a glossary of system design basics. I've personally completed this course and highly recommended many others to use this.
+- ["System Design Interview Course" by Exponent](https://www.tryexponent.com/courses/system-design-interview?ref=techinterviewhandbook) - This course covers system designs basics and has a huge database of popular system design questions with videos of mock interviews. Some of the questions have text answers and a database schema and APIs for reference (which I find helpful). While the subscription might be a little pricey for just the system design interviews content, they also offer quality technical content for [Data Structures](https://www.tryexponent.com/courses/swe-practice?ref=techinterviewhandbook), [Algorithms](https://www.tryexponent.com/courses/algorithms?ref=techinterviewhandbook) and [Behavioral Interviews](https://www.tryexponent.com/courses/behavioral?ref=techinterviewhandbook). The convenience of a one-stop platform which covers all aspects of technical interview preparation is very enticing.
+- ["Grokking the Advanced System Design Interview" on Educative](https://www.educative.io/courses/grokking-adv-system-design-intvw?aff=x23W) - I haven't tried this but it's by the same people who created "Grokking the System Design Interview", so it should be good! In my opinion you probably wouldn't need this unless you're very senior or going for a specialist position.
+
 ## Guides
 
-- [Grokking the System Design Interview](https://www.educative.io/collection/5668639101419520/5649050225344512?aff=x23W)
+- [Grokking the System Design Interview](https://www.educative.io/courses/grokking-the-system-design-interview?aff=x23W)
 - https://github.com/donnemartin/system-design-primer
 - https://github.com/checkcheckzz/system-design-interview
 - https://github.com/shashank88/system_design

preparing/README.md

@@ -1,5 +1,5 @@
 # Preparing
 
-The contents have been moved to the [website](https://www.techinterviewhandbook.org/coding-interview).
+[Contents have been moved to the website. Click here.](https://www.techinterviewhandbook.org/coding-interview-prep/).
 
 <!-- TODO: Remove in future -->

preparing/cheatsheet.md

@@ -1,3 +1,5 @@
 # Cheatsheet
 
-The contents have been moved to the [website](https://www.techinterviewhandbook.org/cheatsheet).
+[Contents have been moved to the website. Click here.](https://www.techinterviewhandbook.org/coding-interview-cheatsheet/).
+
+<!-- TODO: Remove in future -->