Official government travel advisories — USA, UK, Germany, Switzerland and Israel. Check safety and entry warnings before you go.
Government travel advisories are the official, regularly-updated word on safety and entry conditions for a destination — covering security risks, health requirements, local laws and areas to avoid. They're cautious by nature, but they're the authoritative source, and several governments publish them free for anyone to read regardless of nationality.
It's worth cross-checking more than one. The US, UK, German and Swiss advisories often weigh the same situation differently, and reading two or three gives a more balanced picture than relying on a single country's risk appetite. Always check the current advisory close to departure, as they change quickly.