3

Here is my sentence. I feel that "on how to" seems incorrect.

Additionally, my technical skills were helpful in training customers on how to use the company's software.

4

Grammatically valid, yes, but why don't you save yourself the space and doubt by using:

Additionally, my technical skills were helpful in training customers to use the company's software.

There's no meaning change here, and you get extra points for succinctness!

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