Could I be, say a Fighter and put a rank into Spellcraft to identify spells as they are being cast?
Yes.
Thanks.
Imagine your Gm's face when your fighter identifies that the BBEG has Mage armour or something else on. It'll throw him for a loop.
Anyone class can use any skill in 3.5 and Pathfinder. Do note that some of the skills are Trained Only, which requires at least 1 rank in the skill to use it.
3.0 D&D did have a few skills that only certain classes could use: Animal Empathy(Druid and Ranger), Decipher Script (Bard and Rogue), Read Lips (Rogue), Scry (Bard, Cleric, Druid, Sorcerer, Wizard), and Use Magic Device (Bard, Rogue). But those restrictions were removed in 3.5, and so in Pathfinder.
I think a fighter with spellcraft ranks makes perfect sense. They fight spellcasters, some of them will eventually decide that knowing what spells a spellcaster is using on them might actually be useful.
There are traits that give you spellcraft as a class skill as well.
My single classed fighter actually does use spellcraft and arcana. Both skills have been useful. You might like the trait that allows you to detect magic while you're at it.
Anyone class can use any skill in 3.5 and Pathfinder. Do note that some of the skills are Trained Only, which requires at least 1 rank in the skill to use it.
Almost. You need a way to fly every day (or similar) to take ranks in Fly.
Almost. You need a way to fly every day (or similar) to take ranks in Fly.Anyone class can use any skill in 3.5 and Pathfinder. Do note that some of the skills are Trained Only, which requires at least 1 rank in the skill to use it.
You need a way to fly to take ranks in the skill. Anyone can still use the Fly skill, ranks or not, as it is not a Trained Only skill. But my post you quoted has nothing to do with acquiring ranks in a skill, it just deals with using the skills (making checks).