Funny that as a non-native I’m less likely to make such a mistake than natives. At some point I had to learn the basics or something. Not that I don’t make mistakes
I've always been a native English speaker, but my first 11 years of education weren't in the U.S. I also don't have an issue with: their, there, and they're.
Affect and effect were tough for me, though. I still have to think about it for a moment
And slightly off topic, I still can't tell the difference between pansexual and bisexual. Each time I feel like I have a decent internal definition someone comes along to inform me that I've got it wrong
Affect: action impacts you
Effect: your action has an impact
Bisexual: you like boys and girls
Pansexual: you like boys, girls, boys that are girls, girls that are boys, people that identify as themselves…