When you see dirt around you in the world what is usually used for? Who uses it and are there other uses that occur out of sight but which are fundamentally essential for human survival?
I’ve no idea why anyone would need to use dirt. You’ll have to explain like I’m five, sorry.
Farming, landscaping, gardening.
People don't use dirt for that - they use compost, soil, earth, sand, gravel, things like that.
I'm guessing you're in the UK? In most (all?) of the US "Dirt" and "Soil" are used interchangeably in casual conversation, with "Dirt" actually being the more common. "Soil" is only more common when referring specifically to tilled soil, or bagged potting soil. But even those will often be refereed to casually as "Dirt".
planting things..? Like flowers...?
You’d plant them in soil. You’re not going to put a plant in dirt are you?