How to edit CSS file

Hi all, 

Im new into web development and although understand basic elements im having a little trouble understanding how to find the CSS file to makes some edits. With the WP editor the message when selecting Styles.CSS sheet says 'All css files are placed in /css/ folder.
If you want to add your own css code, please do it in /css/custom.css' I dont want to add any custom CSS I just want to fix some issues. 

Thanks in advance


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