After a project announces an airdrop plan, investors should focus on several aspects. First, carefully read the official airdrop rules. Note requirements like the specific blockchain network, wallet type, and minimum transaction volume. Second, stay updated on the project's social media channels for any rule changes or additional tasks. Third, if the airdrop involves using certain DApps, ensure you meet their usage frequency or activity criteria. Also, keep track of the airdrop timeline to complete all necessary steps before the deadline, maximizing your chances of meeting the eligibility conditions.