Link Resources

Hi guys, I tried to access this link [https://linuxacademy.com/cp/courses/lesson/course/2111/lesson/2/module/208] (and all thes links from https://linuxacademy.com/) and when I try to login in linuxacademy, it failed all the time (even when I use gmail or linkedin or facebook, etc). So how can I solve this problem, please? Many thank