Not
The radical not and the kanji not are the same thing! That makes it easy... Not!
Actually, it does make it easy - the radicals make kanji wayyy easier, no?
ふ, ぶ
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To remember ふ we'll use the word "fool." Think of those jokes, where someone says something, then ends with a loud "NOTTTT!" Someone is doing that to you, over and over. What is that person? That person is a fool (ふ).
Be sure to feel irritated at that person. Think in your head as they're telling these dumb "not" jokes how much of a fool they are... and how much of a fool you are for sitting here and listening to them.