My question is whether you can use a normal laptop (not a convertible) with pen for writing, for example. Have seen the graphic designer so synonymous so a pad with pen then draw on the pad and it appears on the display. Does it work the same for writing in Word or PDFs?
Do you mean a graphics tablet, for example from Wacom? You can connect and use it as normal via USB. This can be written in any program with pen support. But it also depends on what features the graphics tablet itself supports.
Some graphics programs for drawing also have special functions to simulate pressure. To label PDF files you need the right program, but it is possible.