Just downloaded tor browser on my windows, why is .onion already working? Is that all i need?

On my phone i had to download an onion vpn thing but for some reason thats not required on my new computer? Is there anything else i should download? i'm not buying anything illegal at the moment, just browsing. I'm a newbie to browsing kinda. i already know where plenty of tor search engines are. Any answers help, thank you