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 1. Variables + Scoping: [Declaring JavaScript Variables: var, let and const](https://scotch.io/courses/10-need-to-know-javascript-concepts/declaring-javascript-variables-var-let-and-const)
 2. Types: [Understanding Data Types in JavaScript](https://www.digitalocean.com/community/tutorials/understanding-data-types-in-javascript)
-3. Objects, functions & arrays: [Intro to Web Dev V2](https://btholt.github.io/intro-to-web-dev-v2/intro/)
+3. Objects, functions & arrays: [Intro to Web Dev V2](https://btholt.github.io/intro-to-web-dev-v2/intro//)
 4. The DOM: [What exactly is the DOM?!](https://dev.to/karaluton/what-exactly-is-the-dom-jhg)
-5. Prototypes + this: [A Beginner's Guide to JavaScript's Prototype](https://ui.dev/beginners-guide-to-javascript-prototype/)
+5. Prototypes + this: [A Beginner's Guide to JavaScript's Prototype](https://fireship.dev/beginners-guide-to-javascript-prototype/)
 6. Events: ["What the heck is the event loop anyway?" By @philip_roberts](https://www.youtube.com/watch?v=8aGhZQkoFbQ)
 7. Flow control: [For Loops - Beau teaches JavaScript](https://www.youtube.com/watch?v=24Wpg6njlYI)
 8. Security and Accessibility: [Web Accessibility](https://www.udacity.com/course/web-accessibility--ud891)
 9. Good to know - How to write clean code: [Clean code concepts adapted for JavaScript](https://github.com/ryanmcdermott/clean-code-javascript)
-10. Async JavaScript. Another epic tutorial by Tyler McGinnis [Async JavaScript: From Callbacks, to Promises, to Async/Await](https://ui.dev/async-javascript-from-callbacks-to-promises-to-async-await/)
+10. Async JavaScript. Another epic tutorial by Tyler McGinnis [Async JavaScript: From Callbacks, to Promises, to Async/Await](https://fireship.dev/async-javascript-from-callbacks-to-promises-to-async-await/)
 11. Other things good to know but don't need to necessarily master as a beginner: closures, Ajax requests, modules. To listen to the episode that inspired this thread: [The Fundamentals — JS](https://syntax.fm/show/162/the-fundamentals-js)
 
 ## Node.js
   - [Koa.js](https://koa) - *(Related to web-servers topic)*
 
 - [wikipedia: Node.js](https://en.wikipedia.org/wiki/Node.js)
-- [nodejs.org](https://nodejs.org/)
+- [nodejs.org](https://nodejs.org/en/)
 - [github.com/nodejs/node](https://github.com/nodejs/node)
 - [developers.redhat.com: Introduction to the Node.js reference architecture, Part 5: Building good containers](https://developers.redhat.com/articles/2021/08/26/introduction-nodejs-reference-architecture-part-5-building-good-containers#what_base_images_to_start_with_)
 - [dev.to: How to build 7,000+ REST APIs within 2 mins (Node.js + MySQL) !!](https://dev.to/o1lab/how-to-build-7-000-rest-apis-within-2-mins-node-js-mysql-470b)
@@ -57,7 +57,7 @@
 ## Npm
 
 - [Npm](https://www.npmjs.com/)
-- [npm has joined GitHub](https://github.blog/2020-04-15-npm-has-joined-github/)
+- [npm has joined GitHub](https://github.blog/news-insights/company-news/npm-has-joined-github//)
 
 ## More Frontend JavaScript Frameworks
   - [Clean Architecture on Frontend](https://t.co/hshyLt0r2x) - *(Related to aws-architecture topic)*