Use zulu.zscaler.com to scan a site and score the risk. Several checks run, that will teach you some things about the responses served, host checks, content checks, and URL checks, rolled up into a 0-100 risk score (that you can ignore because the fine-grained details are more helpful).

Zscaler | Zulu - URL Risk Analyzer

Zulu is a dynamic risk scoring engine for web based content.

Use haveibeenpwned.com to check an email address against the index of multiple data breaches (and dumps that aren't really breaches). The site used to let a domain security contact search for hits on their domain, but that is now a paid freemium feature that can cost quite a bit (fair value though).

Have I Been Pwned: Check if your email has been compromised in a data breach

Have I Been Pwned allows you to search across multiple data breaches to see if your email address or phone number has been compromised.