A tip on finding that config file you just accidentally created or changed.

[crumbs]

Hi People, this might be helpful:
I often get lost in the file structure of Linux and all the different config files for RetroPie.

Perhaps you were trying to change the input for a game, and you just accidentally created a core remap instead of a game remap file.
Here's a fast and easy way using Windows PC with WinSCP to track down that file so you can edit it or delete it.

Enable SSH in Retropie>Raspi-Config if not already enabled.
Use WinSCP software to connect to your pi via SSH.
Navigate to opt/retropie/configs.
Find Files using a file mask of >2020-10-17 to find all the files that were changed that day.
WinSCP lets you edit the files or delete them from your PC.

[Clyde]

Addendum: You can also do that in the Linux command shell.

cd /opt/retropie/configs
find -type f -newermt yesterday

-type f lists only files, not directories.
-newermt yesterday shows only files whose modification time is newer than yesterday.

If you append -ls to the command, you'll get a more detailed output.

find -type f -newermt yesterday -ls

See here for more examples.