At its core, LaTeX puts things in boxes and then puts the boxes on a page. So these commands are central.
There are many packages on CTAN that are useful for manipulating boxes. One useful adjunct to the commands here is adjustbox.
|• \mbox & \makebox||Horizontal boxes.|
|• \fbox & \framebox||Put a frame around a box.|
|• \parbox||Box with text in paragraph mode.|
|• \raisebox||Raise or lower text.|
|• \sbox & \savebox||Like |
|• lrbox||Environment version of |
|• \usebox||Print saved text.|