- Make sure git is enabled (File --> Preferences --> Git Enabled) as other have mentioned.
- Make sure Gits installed and in the PATH (with the correct location, by default: C:\Program Files\Git\cmd) - PATH on system variables btw
- Change default terminal, Powershell can be a bit funny, I recommend Git BASH but cmd is fine, this can be done by selecting the terminal dropdown and selecting 'set default shell' then creating a new terminal with the + button.
- Restarting VS Code, sometimes Reboot if that fails.
Hope that helped, and last but not least, it's 'git' not 'Git'/'gat'. :)