Just showing up

Feeling a little overwhelmed right now. So I get these three plants delivered. Don’t know the strain age what soils what stage. Know nothing about these plants.
Couple of questions I have.
Can you determine how old.
What kind.

The first one is the one I grew from seed. One main thick stalk. Obviously the guy that had the other three knew what he was doing I think.
Question. Is it genetics. Or the way they are cut and grown to give more branches.

You should read the Grow Bible: it’s on here somewhere. Look up ‘Supercrop’ in the Guides.