Install macOS on a new hard drive without any media
This was a great way for me to install macOS without having to use media. So glad that it's this simple.
After clicking the power button and hearing the chim, hold down option+command+r
Then connect to WiFi and select that you want to install the OS.
USB drive - https://amzn.to/2rmFpNy
SSD I used - https://amzn.to/35tdhr6