Artisan goods convert raw farm products into processed items. The useful planning question is not “can this be processed?” but “is the machine time, input and storage worth it for this farm?”
Match machines to production
Build enough machines for the crops or animal products you regularly produce. Too few creates a backlog; too many can consume resources that would be better used elsewhere.
Processing time matters
A product with a high final value may still be inconvenient if the machine is occupied for a long time and you have many other inputs waiting.
Keep raw stock intentionally
Do not process every item automatically. Some raw products may be needed for bundles, gifts, cooking or quests.
Storage workflow
Separate raw inputs, items waiting for machines and finished goods. Simple storage organization prevents accidental selling or processing of something reserved for another purpose.
Scale gradually
Expand processing only when the current bottleneck is machine capacity. Early farms often benefit more from tool upgrades, sprinklers or buildings than from building a huge machine network immediately.
Source: Stardew Valley Wiki — Artisan Goods.