The first images has been designed by @pab.ink. Please do not hesitate to congratulate him (he is on discord).

I once read somewhere that neutrinos are fermions.

This is totally correct!

Neutrinos can be either Dirac fermions or Majorana fermions. This we do not know yet (please see my other comment above where I discuss this topic). The only difference between a Dirac and a Majorana fermion is that a Majorana fermion is its own antiparticle.

PS: there is no stupid question. Only stupid answers :)