Where can I find, e.g., what <CR> and <c (in <c-o>) mean? Like, OK, I can encounter them with the meaning along, but I just want to look up it in some list of all the keys. So, is there a list with the meanings of these denotations and a brief explanation of the syntax?

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These are "keycode" notation. See :h keycodes.

You can get the help of a command using :h CTRL-O for <c-o>. Or you can use :h <c-v><c-o> (where you actually press those keys).

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