How do you check if a website is safe or not?

Hello there, I'm curious about the process of determining whether a website is SAFE or not. Could you elaborate on the steps one should take to ensure the safety of their online experience? Are there any specific tools or indicators that one should look out for when evaluating the security of a website? Additionally, how does one identify potential threats or scams that might be lurking on seemingly harmless web pages? Thank you in advance for your insights.