I would love a class on taking care of my fountain pens. Maybe I'll find something on YouTube.
I did, about eight years ago. Now there is a lathe in my office that I use to make replacement parts for century-old pens.
That said, if you're that skilled with a lathe, it should probably be considered a useful life skill.
If the nib is scratchy, its tines are likely misaligned, and need alignment. You'll need a 10x (or better) jeweller's loupe to check the tines for alignment.
More complex solutions for more complex problems exist, but these are the most common by far. It is possible to pick up these things by watching videos, but I'd recommend you to make contact with your local fountain pen club - such things do exist :)
2. Fill it with the ink you like best. In general, you can't go wrong with Pilot Iroshizuku (again, jetpens)
3. When you're done using this pen, twist it (no need to overdo the torque).
4. When you next need to use it, months (or even a year) later, It. Will. Work.
I own several different fountain pens, and this one is the only one that I can truly call "maintenance-free".
Of course, if you do enjoy tinkering with your fountain pens, don't let me stop you. It's a wonderful hobby!