How to name chemicals?

So we have type I, II, & III naming. If there is an Ionic bond then it is either Type I or II and if Covalent, then it is Type III. I even have some diagrams to help

Which type to name.

Binary Compound?-Yes-Metal Present?-Yes-Does Metal form more than one Cation-Yes-Type I

                                                                      -No-Type III                                                           -No-Type II

Type I) Has Cation with set ionic charge goes with anion EX: K2O: Potassium Oxide

Type II) Has Cation with without set ionic charge that goes with anion EX: Fe2O: Iron (I) Oxide

Type III) Has no cation and uses covalent bonds that mixes ions, naming requires prefixes EX: H2O: Dihydrogen Monoxide