UPDATED: A better way is to use built-in OSX keyboard preferences, learn how here
PC keyboard has different layout from MAC keyboard. Thus, the Windows key is default mapped to Meta key and Alt key to Option key. The easiest way to remap those keys is to use program DoubleCommand.
After install the program, goes to System Preferences > DoubleCommand and tick two options:
- Command Key acts as Option Key
- Option Key acts as Command Key
Then click Activate to make the changes active. That’s all for today folks!