With mythic potions, rings or you can boost your experience (= level bonus), earnings or your referral commission. There is even a market place where you can sell your items for coins.
The level system is powered by experience, which you get in various amounts for a number of tasks.

There are a few variations of PTC-ads. Some are 'normal' websites where you need to keep the window open in order to get the counter down to zero, others are 'surf' or 'video' ads, so you can do other things while the counter goes down. Recently they added a new one: bitco-tasks. Usually it means that you earn more if the time to view the ad is longer.

The challenges reset on a weekly bases. Usually, you need to do a number of offerwalls or claiming the faucet a number of times before you can earn some extra coins or experiences.

You can convert your coins to any of the 20+ cryptocurrencies available. FaucetCrypto offers a few cryptocurrencies that are not that common in the faucet-site-scene.
Keep in mind that sometimes their wallets (for a long time) are empty or in maintenance. The number of coins you need to withdraw vary, depending on the cryptocurrency. You also pay a small fee in coins to perform the withdraw. Usually, you receive the crypto within a day.

FaucetCrypto is a site that you should be in your to go list of faucets, so join now!