I’m trying to log into my Apple ID and it won’t accept my password

You sure you don't have capslock down?

This Apple article has instructions for what to do if you have forgotten your Apple account password, or the system does not recognize the one you remember —> If you forgot your Apple Account password - Apple Support

or go directly to this link —> http://iforgot.apple.com/

If you don't receive your verification or reset email, read this Apple Support article: If you didn’t receive your verification or reset email - Apple Support

"When you make certain updates to your Apple ID, we’ll send you an email to help you complete the update. For example, you might have reset your password, reset your security questions, or added a new email address to your account." Also check your junk mail.

If you find you can’t sign in, reset your password, or receive verification codes, you can request account recovery (read this support article: How to use account recovery when you can’t reset your Apple Account password - Apple Support ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity. This is a multi-step process. More detail in —> Activation Lockout Issues - Apple Community and My Apple ID is locked, how do I fix it? - Apple Community

This page has telephone numbers for contacting Apple for support and service ➞ Contact Apple for support and service - Apple Support

If you are signed into this forum using the same Apple Account then your browser may be configured to automatically enter your password. You should be able to view stored passwords in your browser's preferences/settings.

How old is the Mac? If it is running below macOS Sierra you might need to login With a verification code that you can get from settings on one of your trusted devices instead of your password

I use an older operating system. When I log onto my computer I use my computer password, not my Apple account password.