Let's deal with everything in order.
Airdrops are a free distribution of a limited number of coins to everyone, usually as part of a starting marketing strategy. This allows you to popularize an unknown project and create an information buzz around it. Sometimes airdrop implies the distribution of new tokens by developers to holders of an existing cryptocurrency - for example, 5% of its volume in their crypto wallet. It is profitable and convenient from the point of view of the fact that work is already underway for a loyal paying audience, and not just for random people. It is this audience that is able to invest in the project and give an impetus to its development. But this is ideal. But in fact, everyone can participate in the airdrop. To receive coins, it is enough to perform some elementary action - for example, register on the project platform.
Bounty works similarly to airdrop. The basic principle is still the same - get coins for free for performing certain actions. So what's the difference? In the nature of the actions themselves necessary for the issuance of remuneration. In bounty, they are more complicated, energy-consuming and take longer, but you can also get more. And do not forget about the speed of payments - after fulfilling the developers' request within the framework of the airdrop, the reward falls on the wallet within a few minutes, and in the case of a bounty, verification can take up to several weeks.
But faucets are the very "taps" that were recently discussed in our cryptographic dictionary. In essence, this is a crypto distribution, which is tied to the performance of simple tasks, and in some cases, participation in events. The distribution site fixes rewards, but sometimes it can also set a time lock (temporary lock) to receive them. Most often, to register for a crypto distribution, you need to specify your personal data and the address of the current wallet. After completing the task on the site, the earned reward is sent to the micro wallet automatically created during registration. This wallet is similar to the traditional one, but it is able to accumulate only small amounts of crypto assets. And as soon as it is filled, the tokens are automatically transferred to the user's main wallet. We can assume that all the coins have dripped from the tap.
So, for those who are not yet confident in their abilities, as well as for those who want to get additional earnings, the methods of earning cryptocurrencies discussed above may well come in handy. And for active trading and rapid capital growth, there is the GRIN4 ecosystem, in which both beginners and experienced market participants will find relevant opportunities for themselves.