Others have already mentioned good pens to start with, but I want to mention that the paper is equally important. Clairefontain makes great notebooks for fountain pens that won’t break the bank.
The reason for this has to do with paper composition and weight and how free flowing (liquid) ink interacts with the paper fibers. [1]
The reason for this has to do with paper composition and weight and how free flowing (liquid) ink interacts with the paper fibers. [1]
[1] https://www.jetpens.com/blog/The-Best-Fountain-Pen-Paper/pt/...