Some links that may be helpful for you

 Here are some great links:

Paid online courses: Linux, AWS, Red Hat (recommended)
CodeWars: Practice of several programming languages
10h Youtube course: Ethical Hacking
Many hacking resources (reddit)
CCNA Course (Udemy)
Hacking Challenges
Hacking's Contests
Map of all the possibilities to work in IT
500 Data Structures and Algorithms interview questions and their solutions