Quentin, welcome on Typophile.
It seems you mean it :-)
Besides studying typefaces like Helvetica or Futura it might be worth exploring a Bembo or Garamond the same way, or even the engraved lettering of some old Roman inscription.
Wondering why I recommend those?
Observe e.g. the *skeleton* of the classical Roman R with your pencil, and then compare it to the skeleton of Helvetica’s or Futura’s R.
– Then you’ll probably see why.

