Use a password manager with unique, long credentials, add hardware security keys, and isolate high-value accounts in a separate browser profile. This compartmentalization shrinks blast radius, preventing a single phishing slip from cascading into brokerage access, banking, or cloud backups.
Virtual card numbers, limited-use merchant tokens, and privacy-respecting banks reduce unnecessary sharing. Avoid public peer-to-peer usernames, opt out of searchable directories, and use statements with redactable PDFs for necessary verifications. You keep control of context while meeting obligations cleanly and efficiently.
Create separate email identities for investing, enable masked addresses, and rely on end-to-end encrypted messaging for sensitive coordination. Avoid discussing transactions on platforms that index posts forever. Your future self will thank you when searches reveal nothing compromising.