I'm not sure specifically as I haven't read it. But generally, a 'dungeon farmer' novel might be about a character who makes a living or gains power by farming in dungeons. This could involve fighting monsters in dungeons to collect valuable items, resources, or experience points.
Since I'm not familiar with the 'the top dungeon farmer novel', it's hard to say exactly. However, it might have a protagonist who is the dungeon farmer, and there could be side characters like other adventurers who either help or oppose the main character's dungeon - farming activities. There might also be characters who represent the local authorities or guilds that have an interest in the dungeons.
To create a dungeon manga, start by imagining a world and a story that fits. Come up with creative traps, monsters, and treasures. Also, pay attention to the art style to make it visually appealing.
Not at all. Whether it's right or wrong to pick it up depends on various factors like your expectations, the reviews you've heard, and your previous experiences with similar manga. But give it a try and see if it suits you.