If someone asks me, "Do you know how to do X?" I tell them yes only if I know. If someone asks me, "Can you do X?" I tend to say yes, even if I don't, because,

If someone asks me, "Do you know how to do X?" I tell them yes only if I know. If someone asks me, "Can you do X?" I tend to say yes, even if I don't, because, really, I can learn almost anything related to what someone might be asking me to do.