Are you ready to fly?
betaflight.com
Download betaflight configurator
Cross platform configuration tool for the Betaflight firmware - betaflight/betaflight-configurator
github.com
You may have to install some usb drivers if never hooked a quad up to the computer but basically follow the instructions on the installation and on startup screen of betaflight. You should find a blackbox tab in there where you can either activate blackbox logging if not already enabled and the FC has some flash memory for it or can hit a button to have the FC reboot as SD card and transfer the log files off of it (maybe slow to transfer the files but really best way to see what happened during a flight in terms of the data).
Can dump the files to some file share site like google drive and share here, also can use betaflight blackbox log viewer (separate app) to get a nice UI for examining the logs and playing back the flight in real time or slowed down/sped up to diagnose things.
Interactive log viewer for flight logs recorded with blackbox - betaflight/blackbox-log-viewer
github.com