Broken links (#7336)

* removed a broken link

* removed a broken link, added a new angular course & fixed one broken link

* changed the alphabetical order error

* fixed lint error

* fixed lint error

* fixed lint error

* fixed lint error

Co-authored-by: manigandan <manigandan.elumalai@csgsol.com>

courses/free-courses-en.md

@@ -707,7 +707,6 @@
 
 * [Kubernetes Core Concepts](https://kube.academy/paths/kubernetes-core-concepts) - KubeAcademy (VMware)
 * [Kubernetes Tutorial for Beginners](https://www.youtube.com/playlist?list=PLy7NrYWoggjziYQIDorlXjTvvwweTYoNC) - TechWorld with Nana
-* [Learn Kubernetes](https://www.katacoda.com/courses/kubernetes) - Katacoda
 
 
 ### Linux
@@ -1017,6 +1016,7 @@
 
 * [Angular 12 Course](https://www.youtube.com/playlist?list=PLjsBk8SIQEi-RqkglLcn19TaeeopcuDXV) - Slobodan Gajic
 * [Angular 6 Tutorials](https://www.youtube.com/playlist?list=PLYxzS__5yYQlqCmHqDyW3yo5V79C7eaTe) - codedamn (YouTube)
+* [Angular Complete Course Guide](https://youtube.com/playlist?list=PL_euSNU_eLbeAJxvVdJn5lhPWX9IWHhxs) - Leela Web Dev (YouTube)
 * [Angular Courses](https://www.youtube.com/playlist?list=PLTjRvDozrdlxAhsPP4ZYtt3G8KbJ449oT) - Moshfegh Hamedani (Programming with Mosh)
 * [Angular Crash Course 2021](https://www.youtube.com/watch?v=3dHNOWTI7H8) - Brad Traversy, Traversy Media (YouTube)
 * [Angular Fast Crash Course](https://www.udemy.com/angular-fast-crash-course/) - Edwin Diaz, Coding Faculty Solutions (Udemy)

more/problem-sets-competitive-programming.md

@@ -58,7 +58,7 @@
 * [Hackthebox](https://www.hackthebox.eu) (email address *requested*)
 * [HackThisSite](https://www.hackthissite.org) (email address *requested*)
 * [Overthewire Wargames fungame to practice CTF](https://overthewire.org/wargames/bandit)
-* [Picoctf](https://picoctf.org/resources) (email address *requested*)
+* [Picoctf](https://picoctf.org/resources.html) (email address *requested*)
 * [TryHackMe](https://tryhackme.com) (email address *requested*)