How do you know if an app is sketchy?

How can one identify if a cryptocurrency or finance-related app is potentially risky or unreliable? What specific signs or red flags should users be wary of when evaluating the credibility of an app, and how can they ensure their personal and financial information remains secure while navigating the crypto space? Is there a comprehensive list of checks or due diligence steps that can be followed to minimize the risk of encountering sketchy apps?