How do I know if I got malware from a website?

I'm curious about online security, specifically related to cryptocurrency and finance. Could you help me understand how I can determine if I've inadvertently downloaded malware from a website? I've heard stories of cybercriminals targeting users of cryptocurrency platforms, and I want to make sure I'm taking the necessary precautions. What specific steps or indicators should I look out for to identify if my device has been compromised? Additionally, are there any best practices or tools you recommend for safeguarding against such threats?