OK - I’ll come clean - as a copywriter spelling mistakes jump off the page at me. These raise my blood pressure and mean that I’ll judge you if you constantly use its instead of it’s, your instead of you’re and the wrong version of there, their or they’re. Over 1400 people have been so worried about that they've read my post!
There's a few trip-you-up similar sounding words like Farther and Further, Affect and Effect that get misused. The ones I would like to vent about today however, are Complementary and Complimentary - something over 1400 people have checked out on here!