You might make up a little story for yourself about fictional parents, cars, pets, and the like that you can memorize and then draw on when asked for security answers on different sites. Ultimately, since you're not going to be giving truthful answers, you should go out of your way to remember which lie(s) you told.
Keep them phone friendly: Remember that you could wind up in a situation where youll have to supply these answers over the phone. If that should happen, both you and the person on the other end will have an easier time coping with a series of plain-English words than a bunch of random characters.
How to change your security questions and answers
Each service that uses security questions has its own procedure for choosing the questions and answers (and for changing them after the fact). Check the FAQ pages on the websites for your bank and other important accounts to see how to modify your responses.
Update your Apple info: To change the questions or answers for an Apple ID (which you use for iCloud, among many other purposes), go to the Apple ID page, click Manage your Apple ID, enter your username and password, and click Sign in. On the left, choose Password and Security. Answer your existing security questions, and click Continue. Then you can choose new questions and answers (remember, no two answers can be the same) and also edit your Rescue Email Address if you like. Click Save when youre done.
Update your Google info: If you have a Google account (for Gmail and other services), log in as you normally would. Click the gear icon in the upper-right corner of the window and choose Settings from the pop-up menu. Click Accounts and Import followed by Change password recovery options. Under Security question, click Edit. Choose one of the existing security questions or write your own, and fill in your answer. If you also want to change your secondary address, click the Edit link in the 'Recovery email address' section and fill in the new address. Then click Save.