In setting: keybing/settings keybindings, enter the package name or keybinding to check the “Selector”.
You can copy it with the note mark on the left.
Open keymap.cson from File > Keymap and paste what you copied.
For example, disable ctrl+shift+c for the “Markdown Pdf” package and reassign it to Path copy.
'.platform-win32 .editor, .platform-linux atom-text-editor':
Disabling a Package’s Default Keybinding
First, to disable a package’s default keybinding, write the following in keymap.cson:
'ctrl-shift-C': 'markdown-pdf:convert'
To disable it, use unset!
'ctrl-shift-C': 'unset!'
'ctrl-shift-C': 'editor:copy-path'
In this way, you can disable a package’s default keybinding.