Shotgun + compositing question



I am new to the VFX industry and I was told to learn shotgun for my first gig.
I am new to Nuke compositing and I usually just do it by myself of my PC. I was wondering if people that know about shotgun can tell me if the assets and file I am used to have on my PC will come from shotgun or if shotgun is just a project management software for VFX? What should I learn of shotgun?
I tried to watch some of shotgun’s videos online but I am very confused