You can earn bitcoins online from signature campaign, facebook campaign, twitter campaign, bounty campaign and also from trading and gambling and by offering services try to choose the best possible option that best fits you.
that right
in marketplace on alt-cryptocurensies there is many bounty that you can join and earn that coin
after you get that coin, you can sell it to bitcoin and then you can save it to your wallet
Earning bitcoin is not limited only to signature campaign as there are multiple ways of earning it and it will depend on what skills you hold and for me the best ways to earn bitcoins is from signature campaign and trading.