That really depends on what else is inside and outside the parentheses. If there is just a parenthetical expression in a sentence, then the period goes outside it. For example, "In addition to the roast, there was a side dish of vegetables (peas and carrots with tiny onions) and a potato casserole." There can also be an entire sentence in parentheses, and in that case, the period goes inside the parentheses. For example, "He insisted that we tell him why this had happened and who was responsible. (No one knew.) He proceeded to make increasingly alarming threats."
In American English, periods typically go inside parentheses when the parenthetical phrase is a complete sentence. In British English, periods go outside parentheses unless they are part of the parenthetical sentence.
(In side!)
A period would go inside parentheses to finish a complete sentence, but you always need sentence-ending punctuation outside of the parentheses.
Outside. (But if the entire sentence is a parenthetical like this one, it would go inside.)
Periods should typically go on the outside of parentheses. However, if the entire sentence is contained within the parentheses, then the period should go inside.
In American English, a period goes inside the closing apostrophe when it ends a sentence. However, in British English, the period goes outside the closing apostrophe. For example, "I love eating pizza." (American English) or "I love eating pizza". (British English).
Punctuation usually goes inside the parentheses if it's part of the text within the parentheses. If the entire sentence, including the parentheses, is a standalone sentence, then the punctuation goes outside the parentheses.
The comma typically goes before the parentheses if it is part of the main sentence. If the parentheses contain a complete sentence, the period or other punctuation mark will typically go inside the parentheses.
Use a period to end the final sentence within the parenthetical, then use a period outside of the parenthetical to close the sentence in which the parenthetical takes place.
If a quote ends a sentence and is followed by parentheses, the period goes inside the parentheses. For example: She said, "I will be there on time" (if nothing goes wrong).
When taking information from a reference book, what two bits of information must go inside the parentheses
If the content of the footnote is related to the entire sentence within parentheses, then the footnote should go outside of the closing parenthesis. However, if the footnote only applies to a specific word or phrase within the parentheses, it should go inside the closing parenthesis after that specific element.
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.
It will depend on the specific usage. She said, "I have to go." "I have to go," She said.