#StaySAFU is a popular cryptocurrency community hashtag and mindset focused on promoting security and caution to protect investments. It emphasizes understanding and avoiding scams like phishing, rug pulls, and fake ICOs. Key principles include using strong passwords, being wary of suspicious links, monitoring accounts, securing assets with reputable wallets/exchanges, acknowledging risks, and staying informed about security best practices. The goal is to empower users to navigate the crypto space safely and prevent financial losses.