It depends what you man by "Excel"
If you are referring to the computer program, it is referred by the same name. Spreadsheets can be called "Hojas de Excel" meaning "Excel pages"
If you are referring to verb which means to perform incredibly well, the Spanish is "sobresalir".
The word is "celda."
The question is not clear. I would just say, "I recommend Excel."
There are lots of ways to say it. Here are some: Kim needs some training in Excel. It would good for Kim to get some Excel training. Kim would benefit from some training in Excel.
Sister in law in Spanish is cunada.
How to say "hi" in spanish is Hola. How to say "bye" in spanish is Adios.
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