One thing to earn in the cryptoworld in joining bounty campaigns. However, bounty campaigns are
(i) time consuming and
(ii) risky
Bounty campaign is time consuming
You need to invest your time and effort to fulfill the requirements of bounty campaign. Most bounty campaigns last for 2 months (excluding the waiting time for you to receive your rewards). Hence, you need to be patient and persevering if you really want to learn
Bounty campaign is risky
It is risky because you are investing (not money but your time and effort) something with a high risk of return (and getting a reward). Some bounty campaigns are scam, many do not reach its goal (or soft cap), and many attained its objectives but reward a little.
True, bounty campaigns are also not reliable, some are scams and some are not scams yet they won't pay you what they should have paid you.