petervdfl :
I'm planning to build my first pc and I don't know how to install drivers if I need drivers for my internet to work, so can I do it without a USB wifi adapter?
What you should do is, from another working PC, download the relevant LAN and WiFi driver. Save to a USB stick.
Given that, you can get anything else.
But...the OS will almost certainly install a basic LAN driver.
WiFi, probably not.
But if this is a desktop, why WiFi?