As far as I remember, the pen was my constant drawing tool. I used to draw a mustache on ladies from newspaper covers, draw during a long telephone conversation, and draw on the margins of a school notebook. Thanks to such a long work with this accessory, I got used to the fact that it is impossible to erase it and you need to draw perfectly immediately.
It is worth noting that sometimes ordinary pens can give very nice effects. It will probably take some time to find your favorite kind of pens, but as soon as you find it, you won’t want to part with it. Look for one that does not leave ink stains when gently pressed. (In addition, wipe the tip of the pen well from time to time). I try to convince my readers to use a pen, if possible, because it is a very cheap method. Skeptics say this is boring because we only have one shade and one effect: a line. But this is not true!