Firstly, regarding cybersecurity protection, when querying an English "me" domain name, we need to ensure that the website is secure and not vulnerable to cyber threats. We can use various tools and techniques for this purpose, such as SSL certificates, firewalls, intrusion detection systems, etc. Additionally, we can also conduct regular security audits to identify and fix any vulnerabilities.

Secondly, when it comes to funds, an English "me" domain name can be used for financial websites or applications that offer investment opportunities or financial management services. However, it's crucial to ensure that these websites/apps are secure and reliable, and follow all the necessary regulations and standards. Therefore, during the domain name query process, we need to verify the credibility and legitimacy of the website/app before using it.

Lastly, for second-hand books, an English "me" domain name can be used for online marketplaces or platforms that allow individuals to buy and sell used books. In this case, the domain name should reflect the nature of the business and be easy to remember. Furthermore, it's important to implement robust security measures to prevent fraud and protect users' personal and financial information.