Take, for example, the idiom construction in the example sentence shown in the graphic.
The use of between here is inappropriate because by definition between links two separate items. A more appropriate word is among, as its definition includes connections between more than two items. The writer should rewrite the example sentence to appear thus:
The big writing mistake here is likely the one I have discussed the most — a failure to distinguish between spoken English and written English. When writing, go between two items but among three or more items. Your writing will improve along with the professional image you project through your writing.