From where i could learn ethical hacking ?

Answer 1

Look up on google, there will be several good tutorials

Answer 2

https://www.udemy.com/ethicalhacker/?utm_term=_._pl__._pd__._ti_aud-299743149027:kwd-297105270605_._kw_ethical+hacking+course_._&utm_medium=udemyads&gclid=Cj0KCQjwxtPYBRD6ARIsAKs1XJ74Wm-1nlBL2EgIyYn23NMOtaRzOvpP2oOsNHnJw2hvsoiPQLjVkpEaAqRVEALw_wcB&matchtype=e&k_clickid=dfb1951c-0a3c-4dbf-ba49-193ca2596208_426_GOOGLE_NEW-AW-PROS-ROW-NONP-TestPrep-EthicalHacking-EN-BBB_._ci_1483206_._sl_ENG_._vi_NONP_._sd_All_._la_EN_.__course_ethical+hacking+course_e_267337410169_t&utm_content=_._ag_course_._ad_267337410169_._de_t_._dm__._lo_9067614_._&utm_source=adwords-row&utm_campaign=NEW-AW-PROS-ROW-NONP-TestPrep-EthicalHacking-EN-BBB_._ci_1483206_._sl_ENG_._vi_NONP_._sd_All_._la_EN_._

Answer 3

http://opensecuritytraining.info/Welcome.html