It is a statistical fact that five people in every class of one hundred forget their password sometime in their first year. How you get and change your password will depend upon your own site. You will be told. Unfortunately I can't help you to remember your password, but there are many tips you ought to follow in order to make your password difficult to guess. You must never make your password a word in the dictionary.
Some computers reject any password which is in their dictionary for that very reason.
It is a bad idea making your password a swear word or any word related to sex. These are very common passwords and these are usually appended to the word list of our proverbial hacker program. Make the password long. Another tip is not to use the names of your wife, boyfriend, kids, cat. Don't use your car number plate or phone number.