The speaker emphasizes the importance of controlling personal data online to avoid spammers and scammers. He suggests using a separate phone number for non-personal interactions to prevent unnecessary data sharing. Reviewing app permissions is crucial to ensure apps don't access unnecessary personal information. The speaker recommends using privacy-focused applications like DuckDuckGo and Signal for better data protection. He advises against oversharing personal information on social media, as it can lead to unintended exposure of sensitive data. Additionally, using temporary emails for non-essential sign-ups and avoiding public Wi-Fi without a VPN are recommended practices. These measures help maintain privacy and protect personal data in the digital world.