At least you can melt butter. I have seen recipes that measure bananas in cups. How can I measure a cup of banana? Also, how many measuring cups should I keep

At least you can melt butter. I have seen recipes that measure bananas in cups. How can I measure a cup of banana? Also, how many measuring cups should I keep in my kitchen? You cannot measure oil with a cup and then measure flour with the oily cup. Going from flour to sugar? No, measure sugar first and flour second to avoid contaminating the sugar. I need to spend spend too much mental energy trying to measure everything with a cup without having to wash and dry it 10 times in between.