I made coffee using actual coffee beans. Don’t know which kind because someone already pre-grinded them. But it tastes like an actual drink you’d serve a human being, and not sour water with a hint of coffee flavor that is instant coffee
I’m still tired though, so the caffeine content is weak.
I like medium roast but that's all up to taste. You're choosing to taste either the beans or the roasting process, in a gradient from light roast to dark roast. Also from more caffeinated to less.
The greater the ratio of beans to water, and the shorter the brewing time, the less bitter/caffeinated it will be. Cold brew is an exception because it's watery and takes a whole day to make, but isn't bitter at all.