This is quite difficult as no one knows what your real level is, or what you need ( if you are not e.g. in the financial world, why give you tips for financial functions? )

I would recommend dabbling around in XL forums and have a look around. There are very good ones, not affiliated to MS like excelforum or MrExcel ( they have their pros and contras but are great sources for XL knowledge). Try to solve some simple problems and look at answers from people over there

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