Where does the period go when using parenthese?

Answer 1

If one or more sentences are between parentheses, then put the period or other final punctuation between the parentheses:

Always thank the bellboy. (Usually you should also tip him.)

Otherwise put the period or other final punctuation outside the final parenthesis:

Always thank the bellboy (and any other staff who has aided you).

The period or other final punctuation belongs to the sentence as a whole. If the entire sentence is within parentheses, naturally that includes the final punctuation. If the parentheses enclose only part of sentence, naturally the final punctuation goes outside.