What if I totally forgot my Apple ID and password what will I do

Well, your Apple ID is your email address, so it should be really hard to forget. And you must have used your Apple ID and password to post in this forum, so it’s unlikely that you forgot both. But Apple can still help your forgetfulness if you can prove that you really are who you say you are. See these to links:

• Apple ID: How to find your Apple ID
• If you forgot your Apple ID password - Apple Support

But note that Apple is very careful about protecting you from people who might try to impersonate you.