For example, English speakers commonly mix up your/you’re or there/their/they’re. I’m curious about similar mistakes in other languages.
For people on Linux, enable the compose key in your keyboard settings and then type [Compose] [n] [~].
The compose-key method for entering accented letters is by far the easiest to use for any desktop OS … but it’s not enabled by default because you have to give up some modifier key to use it.
It’s completely off-topic but Compose is amazing. Specially as you can actually customise it for your usage, with a .XCompose file. For me it’s the only think that makes phonetic transcription flow, otherwise you got to shift layouts back and forth to write something like “[tɾɐ̃skɾi’sɜ̃ʊ̯] ⟨transcrição⟩”.