Crypto malware includes keyloggers that record what you type, clipboard hijackers that swap addresses, and infostealers that harvest your passwords and seed phrases.
Update your operating system, browser and antivirus regularly. Most malware exploits known vulnerabilities that patches already fix.
Do not install cracked software, pirated games or random browser extensions. These are common delivery vehicles for infostealers.
A hardware wallet keeps keys off your computer entirely, so even a fully infected machine cannot sign transactions without your physical confirmation.
Only install well-known wallet extensions and revoke any that you no longer use. Malicious extensions can read your clipboard and page data.
Good hygiene and a hardware wallet remove most of the surface that crypto malware relies on.