Basics of Fountain Pens
The swappable nibs will fit on: Classic Sport (plastic) Al-Sport (metal) Liliput Allrounder Dia2 Special If you get a spare nib, it often comes in either a plastic section (some of the Sport nibs, and most of the italic nibs), or a nib housing, which is smaller and just around the nib and feed.
Most fountain pen inks are not super water-proof. There are some that are more waterproof than others, but most have some limited resistance.
The faster you get water and soap on your hands, the better. If you know you are going to be doing inky work, and want to avoid inky hands, it's best to wear gloves.
Often when people start using fountain pens, they discover quickly after that not all paper is made equal.
If you have a fountain pen that takes a cartridge or converter, and you have the converter for it, this is the post for you on how to keep it clean.
For piston-fillers, you don't need a converter or cartridges (as the pen has the "converter" built right into the pen barrel") so all you need is a bottle of ink.
One of the best features of the Kaweco Sport is that you can easily and quickly turn it into an eyedropper - enabling you to hold a ton of ink, and if you're using the clear demonstrator, have a moving air bubble in a tube of ink to keep you entertained during long meetings.
When I received my first fountain pen, it came with a single cartridge, and gift giver (Jon) included two extra cartridges.