– https://developers.facebook.com/docs/facebook-login/android/?sdk=maven – https://stackoverflow.com/questions/5488339/how-can-i-find-and-run-the-keytool – https://www.youtube.com/watch?v=BtL0ZknXxlM&list=PLfVdvKscEioMSVPWYUW0XD3CKKohUYMEG&index=46 – https://www.youtube.com/watch?v=6BG1CR9iWiA&list=PLfVdvKscEioMSVPWYUW0XD3CKKohUYMEG&index=47 – https://www.youtube.com/watch?v=A9HGl7o4SKw&list=PLfVdvKscEioOgxKhAz_LFBjrQcyXImD_K&index=41