Yes, it is free with a daily message limit. You can check your remaining messages directly on the AI page.
Are the tutorials free?
Most tutorials are free. Any paid course is clearly marked with its price before you unlock it.
I paid for a course, where is my access code?
Your access code is shown right after payment and also sent to the email you used at checkout. If you cannot find it, email [email protected] with the email you used to pay.