How to get to a certain set of coordinates in Minecraft PC?

/t X Y Z

where X Y Z are the co-ordinates

Generally hitting F3 (which toggles the debug screen) is useful to find the X, Y, Z coordinates of where you're at & will update in real-time as you move (but might be annoying, if you're not accustomed to it). It's generally helpful when you want fairly precise measurements for large-scale projects, since it's annoying to be ever so slightly (like one block) off on stuff.

Please be aware that most map coordinates are noted as X, Z since the Y-coordinate is the height (altitude) measurement, which is based on how far away you are from the bottom of the world. Unless the location is underground or underneath something, it's generally excluded.

The Y-coordinate is usually around 64 at sea level. This means that underground stuff will be below this (usually around 40). Stuff in the hills will be higher (around 70-75) & mountains around the 96 mark. Most naturally generated terrain will be under the cloud mark (which is around 127), but the highest you'll ever see in the Y-axis is 255 as that's the absolute height limit on any given world (since version 1.2.1)

Hope this helps!