Does a friend of yours speak so much of how his life has become much better ever since he joined bitcoin?
If yes, have you also witnessed what he said to you?
Does his life actually improve after he joined Bitcoin?
Or is he just saying sweet words to entice you to join Bitcoin?
I think the later is meaningless because bitcoin is not a Ponzi scheme and is not a referral program. Whether you join bitcoin or not, it does not add anything to his success and neither does it subtract. So you have to meet your friend to know more about bitcoin. It is not all about earning you have to learn first before you earn.
Try and read the books shared to you by dzungmobile