1. parenthesisUse parentheses ( )VERY RARELY for extra, less important, information or asides to the reader.

      Arthur guessed (quite wrongly) that it might be ultra violet.
      1. Do not start the part inside the parentheses with a capital.

      2. Use punctuation inside the parentheses only to punctuate the part inside the parentheses. Punctuation for the whole sentence belongs outside the parentheses.

        Zaphod Beeblebrox, adventurer, ex-hippy, good timer, (crook? quite possibly), manic self-publicist, terribly bad at personal relationships, often thought to be completely out to lunch.
      3. Don't put a comma before a parenthesis.

      4. If you use an open parenthesis, there must be a close parenthesis later.