Certik Airdrop: guide how to participate and claim
Certik is a security auditing company that also has its own platform for analyzing crypto projects. It allows you to complete quizzes and other social tasks with the expectation of a potential airdrop.
Certik Skynet
Skynet by Certik is a platform for analyzing projects and participating in social quests. To register, go to skynet.certik.com/quest/signup, click the Log in button and create an account using your email. Next, go to the Quest tab and start completing simple tasks.

The questions are mostly related to the security of a particular service. At the top of the page, you can go to the daily tasks, sometimes they change, but usually they are related to simple actions, for example, viewing statistics of two projects.
Other ongoing airdrops
Sign
Sign is a protocol for storing and verifying data. This airdrop is a potential airdrop and it is not known when it will happen.
Harmonix
Harmonix is a protocol that collects various vaults from other projects, investments in which will lead to passive yield.
OpenSea
OpenSea is the most popular NFT marketplace where you can buy or sell your NFTs from a wide variety of collections.