The documentation isn’t especially clear—CTRL+T is to jump back in the tag stack, whereas CTRL+O is to jump back to the previous cursor position. What’s the difference between CTRL+T and CTRL+O? They both appear to exhibit the same behavior.
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CTRL–T is working with tag stack
CTRL–O is working with jumplist
Tag stack and jumplist are different list in vim, but they might have same items when you jumping through tags (eg. using CTRL–])