When we enclose things in punctuation such as brackets or inverted commas, any punctuation we use inside applies to the content between the punctuation, not the content outside of it.
Therefore, if I was writing a sentence, and I wrote a sentence in brackets which ended with a full stop, would I close the brackets and then use another full stop to look like this
blah blah blah blah (blah blah blah.).
Or would I not use a full stop inside the brackets:
blah blah blah blah (blah blah blah).
Although I think there are situations when that can’t be avoided.
Or would I close the brackets after the full stop, which is incorrect as far as I’m aware.
blah blah blah blah (blah blah blah.)

I’m pretty sure that the second one is correct.. I think!
I always thought it was the first. I can’t think of a good example of it right now, but when I do… When I doooo *shakes fist*
Example: He was a geek. He always was a geek.
Keeping is as 2 separate sentences: He was a geek. (He always was a geek.)
Keeping it as one sentence: He was a geek (he always was a geek).
Does that help?
No :P
Ah, here we go.
I have both (because they are different!).
I have both (because they are different!)
I can’t think of one with full stops just yet though.