Hey. I'm a student and i bought a book whichin are presents some exercices. One of them is about the software Packet Tracer and there is written that i can download it from here. it's just i can't find it.
Good to have you on board for studying, I wish you best of luck with it. I am not familiar with packet-tracer being available here but I downloaded it from the netacad (netacad.com), I am not familiar with it being available in the support forums.
What I can recommend you is that you can also use GNS3 to simulate everything or WebIOU as well. IDK if I can post any link for the GNS or WEBIOU downloads here so you maybe is gonna have to find it.
Packet Tracer is available (bit-torrnet) on below mentioned links, you may also use GNS3 for Cisco Lab as other member also suggest also, but as you said you are a beginner so I suggest Packet Tracer because GNS3 is required cisco IOS for every platform (router) and also some expertise to use.
To download the Packet Tracer program, you must have the Netacad.com protal credentials
To obtain them, you can visit this website and take the free courses they teach(https://www.netacad.com/portal/self-enroll/c/1008829).
Once you have the credentials, you can download the program from there.