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Mooret, nobody is going to answer the question of high paying keywords. You know why? If I knew a "high paying keyword" (assuming they exist), and I would tell you about it, the value of that keyword would drop instantly. Cause as of that moment, you would be fishing in the same tiny bowl as I am, thus reducing my earnings.
There is one advice I can give you. Read, read, read.
Read as many threads on this forum as you can, invest time to learn how things work, we all did. Then, you will find your keywords...