If freedom of speech is absolute, how come it's not applied for private spaces and for the Internet?

You have freedom to travel. If I loan you my car, I can tell you not to take it out of town, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

False advertising

Threats of violence

My parents force me (15yo atheist) to go to church, and there’s this thing called Small Sundays where we discuss the Bible in groups, there are questions asked about the Bible. What am I supposed to do when they ask?

That’s what it is. You have no right to use other people’s stuff. If people let you use their stuff, they can tell you how you can use it, and they can tell you to stop using it any time they want.

Terroristic threats

Insurrection

The Black Hole Universe: New Model Suggests The Big Bang Was Not The Beginning Of Everything - IFLScience

No freedom is absolute.

Conspiracy

Child pornography

Harvey Weinstein Says He Has ‘Regrets’ and ‘Acted Immorally’ Ahead of New York Retrial Verdict: ‘But Never Illegal, Never Criminal’ - Variety

Freedom of speech does not apply to:

Fraud

If you’re wondering why free speech doesn’t apply to the internet, it’s because you have no right to use other people’s stuff for free.

Why do men like women gold diggers?

Trade secrets

And much, much more.

Revenge porn

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You have freedom of speech. If I loan you my computer, I can tell you not to use it for certain things, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

Insider trading

HIPAA violations

Is it sinful for Christians to look at beautiful women?

Perjury

Revealing classified information