How can I set who can write to me in Twitch Chat or that everyone can write to me?

Can I virtually set and if so where? Can only followers or viewers write to me?

By default, all viewers can write in chat.

However, you can also activate a "followers-only mode" so that only followers can write in the chat.

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You can set this, for example, in the Quick Actions in the Stream Manager…

https://dashboard.twitch.tv/stream-manager

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Respectively. Can you do that with the mod view too…

https://www.twitch.tv/...nKanalname
[You should replace your channel name in the link "HereYourChannelname".]

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Respectively. Can you do that with commands that you write in your chat…

https://help.twitch.tv/...t-commands

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If you meant whispering messages, it is not so easy to filter out followers. However, you can, for example, set in the privacy settings that (with exceptions) only people can write whisper messages that you have previously written to yourself.

https://www.twitch.tv/...s/security

Thank you very much for your detailed answer. You really helped me! Thank you. I'm new to the topic and not quite as fit with Twitch.