For Troubleshooting2(LinuxMacEdish) you will need either a monitor and keyboard, or to set up a internet connection to ssh into the Pi and wirelessly ssh that way first to access the Pi terminal to input commands. LaterI may get around for a way to just copy/paste made files. You can do this either during initial flashing of the Pi OS in Pi OS flasher program or:

1. Make file called wpa_supplicant.conf
2. in the contents put: country=us (can change this to a 2 letter code for your country of choice) update_config=1 ctrl_interface=/var/run/wpa_supplicant

network={ scan_ssid=1 ssid="MyNetworkSSID" psk="Pa55w0rd1234" }

For SSH: Again, enable in flasher program settings or just add a empty (no contents) file "SSH" or "ssh" with no extension (no .txt or smth) and put into bootfs.

After you can delete the wpa_supplicant.conf if you want as you will be able to ssh if you followed steps in other files