If you feel uncertain about your grammar, you can second-guess your writing, and lose time double- and triple-checking correspondence. One issue with English is that a word can change forms, and sometimes those form changes can seem inconsistent. One particularly frustrating word is who. It can be difficult to keep track of when you need to write out whose instead of who's. Whom is also a tricky form and one that people are sometimes reluctant to ever use.
The meaning behind a message can become murky when you leave grammatical errors in something you write. A lack of clarity hurts readers of your work and may reduce its value in their eyes. You obviously want your work taken seriously - small mistakes can undermine that, while also making you feel uncomfortable about writing in the future.
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