its not a thing to learn lot.airdrops are couns which hiven by projects to promote their projects.usually they distribute small amount of coins among early members who submitted forms.sone times you may havve to complete some easy tasks like fb sharing/tweeting/retwet and ect to get rewards.majority of projects give you very small amount of tokens/coins/rewards.but there may be some golden airdrops.they will give significant amounts of rewards for you. how can i find good airdrops? for that you will have to join with airdrop alert channel and fill forms and submit them as soon as possible.i jouned with cryptocurrency 6 monts ago and i earned more than 2000usd from airdrops...its just for motivation.goodluck