Participating in signature and social media campaigns is the easiest way to earn BITCOINS . But the time it will take you to earn a healthy amount is very long as the payments are not very high.
Trading on various exchanges is a good way to earn huge profits rapidly,but trading is risky .of you don't understand the highly volatile crypto market,you are sure to loose your money.
Working as a freelancer is also a good way to earn bitcoins and you get paid well for your work,