As I am mainly left-handed, I learned to like writing with a nice wooden pencil, like Faber-Castell, and a sharpener. Then, if it is something serious and if it is possible to use a felt pen, I use Staedtler or Faber-Castell felt pens in different sizes. I hate ballpoint pens.
I'd like if you address the main point of his post: being left-handed.
I've never liked fountain pens because most languages are written left-to-right, which means you will get smudged much more easily than if you were right-handed.
The seemingly best advice I've seen is to learn how to be an "underwriter", aka position your hand north to where you're writing, instead of sideways. I say seemingly because I'm not willing to spend that amount in effort when I can write fine with pens.
The issue with being left handed, when writing a language that is written left-to-right, is the hand gets dragged over freshly written ink. A fountain pen has liquid ink that takes longer to dry than a ballpoint pen, it would make things significantly worse.
Have you tried a good fountain pen? A good nib makes all the difference.