[Tex/LaTex] How to solve `Underfull \vbox’ and `Overfull \hbox’ warning

overleafwarnings

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I got some warnings like this, but the display of my PDF seems ok, nothing wrong can be found in the report, I wonder what the problems are?
I've read some answers here but still no idea, can anyone help me? Many thanks.

Best Answer

LaTeX (TeX, really) is very picky. A \vbox is a vertical object, something like a page, if it complains it means it came up short to exactly fill the space or is too large. Ditto por \hbox, a horizontal object typically a line.

If the problems are smallish (and not visible), you can ignore them. Often minor margin overruns can be fixed by rearranging a paragraph, use different wording, or such. The vertical complaints are often due to asking to place a figure or table where it doesn't fit, or asking for pages of the exact same length.

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