What do libraries marked as red indicate?
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I get this all the time, always had. Could someone please explain to me what libraries being marked as red indicate?

Thanks in advance
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JavaDoc and Sources are not downloaded by default, therefore the paths will be marked in red.
You can enable the option to download them and reimport:
How to enable annotations which is highlighted in yellow?
@... May you elaborate on what you are trying to achieve? The "Annotations" checkbox Settings (Preferences on macOS) | Build, Execution, Deployment | Build Tools | Maven | Build, Execution, Deployment | Build Tools | Maven | Importing can be just clicked to become activated.
Serge Baranov Thanks, that was helpful.