What to look for in tenants and what to avoid?

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Hey everyone, I'm new to this forum and would like to pick some of your brains about choosing tenants. What do you look out for when choosing? I have had 2 tenants with 620-625 credit scores apply recently. Would this seem too low? Is it a red flag? Also, when looking into their work situation what is the best income to rent ratio I should be looking for? Any other helpful tips or hints would be great. Thanks all.