Don't worry. Those are just shortcuts for commands, no science or mystery. Over time, one may know them or know where to read about.
It's fine to ask here in the forum, it's a quick way with quick answers and people may also find it later when googling their stuff and challenges.
LaTeX forum ⇒ Graphics, Figures & Tables ⇒ Vertically centering text in a tabularx (again!) Topic is solved
Information and discussion about graphics, figures & tables in LaTeX documents.
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