How do you know if a website is not trustworthy?

How can one discern whether a website is trustworthy or not? Are there any tell-tale signs or indicators that one should be wary of? For instance, should we avoid websites with poor design or unclear language? What about websites that request sensitive information without adequate security measures in place? Are there any red flags that immediately signal a potential scam or fraud? Understanding these factors is crucial for protecting oneself in the digital age, especially when it comes to managing finances and cryptocurrency transactions.