So now a days crypto currencies is popular. Why it is so popular ? Read this Crypto currency is good
If you don't have any investment and you want to buy a coins so here is a solution when every new crypto currencies launch they started a promotion camping and they giveaway some free coins just for joining them and if you refer their coins to your friend then you get referral bonus so here is some ICOs which gives you free coins join them refer your friends and get free coins.
So why are you waiting for just go and signup and get your free coins without invest single penny and refer to your friend with you referral link and get bonus when they join on your referral link.