Trading and gambling but both have risk
Gamble is just lucky in short runs and you always will lose in a long run
Trading have risks of course however you can study and minimize the risks/raise the profits.
Many ways to earn bitcoins arise, there is hyip, trading, betting, even the what you cslled paluwagan also rise in bitcoins. I think the best source of bitcoin was those free faucets. I know you will not gain thst much in free faucets but think of this, all you have to do is claim and spread the website to earn more from referrals.. at least you dont have capital that can bring you nervous if your bitcoins will grow or the founder will run the money.