This is a very common request and sadly it is not easy to set up. It is NOT the same as setting up a regular desktop PC because you have to consider both how both the PC itself and your virtual machines are going to access the network. I'll tell you right now that you will be MUCH happier with a hard-wired setup.
Be that as it may, the first problem to face is that PVE does not install the utilities and tools you need to set up wifi. PVE is not a desktop distribution, it is for servers, and servers almost never have wifi as their main interface. Happily the tools can be installed easily using the package manager:
apt install iw wireless-tools wpa-supplicant
The next problem is that you generally cannot use wifi with bridging due to wireless security. The vast majority of access points reject Ethernet frames that have a source MAC address different from the one that authenticated with the access point. This means you can't use the standard setup with a virtual bridge (vmbr0) to connect your virtual machines to the network because each VM has its own MAC address. Typically a routed configuration with the VM's living behind a NAT firewall is used to work around this.
Here are some guides to get you started. This one shows how to set up wifi manually for a scenario where only the PC itself needs to access the network, no virtual machines:
https://wiki.debian.org/WiFi/HowToUse#Using_ifupdown_and_wireless-tools
This one has some links to ways to set up wifi on Proxmox:
https://pve.proxmox.com/wiki/WLAN
There is also this forum thread about a routed+NAT setup:
https://forum.proxmox.com/threads/howto-proxmox-ve-8-1-2-wifi-w-snat.142831/
Another option is to go with a desktop virtualization product like VirtualBox. Those products configure routed/NAT setups by default since they are intended to run on a workstation or laptop where wifi is a common interface.
Good luck!