How do you check how trustworthy a website is?

When it comes to navigating the vast landscape of online resources, especially in the realm of cryptocurrency and finance, it's crucial to ascertain the trustworthiness of a website. So, how exactly does one go about verifying the credibility of a site? Are there specific tools or methods that you recommend to ensure the safety and security of one's personal information and financial transactions? Additionally, what are some common red flags to look out for that might indicate a website isn't as trustworthy as it seems?