He made a basic mistake when creating the report.

He made a careless mistake when submitting the report.

He didn't notice the spelling mistake in his report.

He made a spelling mistake in an important report.

He is a complete stranger to me.

Are there any points you are unsure about in the explanation so far?

He fell and got an abrasion on his knee.

He has the ability to change into a wolf.

She uploaded a selfie to Instagram.

She took a selfie and uploaded the photo to social media.