What should I study first in networking ?

Hello everyone !

I'm a network & system technician since 2012, and I did'nt got an opportunity for a job in the networking or IT domain, so I want to update and restart my profil as a network & systems admin or technician...In the netacad website , I got some courses (From a facebook group, they allow me to access to this courses) , and this courses will expire by 19th april , and I don't know what should I study first ! (I already started with CCNAv7 : introduction to networks)

Here is the courses that I'm enrolling but what should I study first ??!

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CCNAv7 : Introduction to Networks

CCNA Security

CyberOps Associate

CCNAv7: Switching, Routing, and Wireless Essentials

CCNAv7: Enterprise Networking, Security, and Automation

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How can I get some other courses in the netacad website like that ?

Thank you guys !