1. Simply use the & operator to join strings.
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Note: to insert a space, use " "
2. The CONCATENATE function produces the exact same result.
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3a. The CONCAT function in Excel 2016 produces the exact same result.
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3b. The CONCAT function can also join a range of strings. If you don't need a delimiter (space, comma, dash, etc.) this can be useful.
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4a. The CONCAT function cannot ignore empty cells. Take a look at all the extra spaces in column E below if you drag the function in cell E2 down to cell E11.
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4b. The beauty of the TEXTJOIN function in Excel 2016 is that it can ignore empty cells (if the second argument is set to TRUE).
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Note: the TEXTJOIN function joins a range of strings using a delimiter (first argument)..