many times when we use VSCode to open a file sent by someone else or modify a configuration file, we will find that the file cannot be modified.
does not mean that files cannot be modified, but VSCode editing adopts the mode similar to Vim editor. Only when you type I can you modify. After the modification is completed, you can type Command+S(MacOS) or Control+S(Windows) is unable to save.
detailed usage of the vim editor can be seen in [MIT open class (a missing lesson in computer education)]3. Editor (Vim).
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