Windowsill Grow Week 4

Currently growing 4 purple power plants on my windowsill,
Basically just wondering whether it's worth using any techniques such as topping etc at this stage

The photos are of one of the plants but the others look exactly the same
The reason they're leaning is because of the sunlight being on one side I'm guessing, is it worth rotating them every now and then or should I leave them as they are?

hey i started off on my window sill. i wouldn't top it or anything yet its only small. i would rotate it everyday so all the plant gets light. they not lookin too bad tho their standing up nice and green! keep it up.

Should I start giving them nutes yet?
If so what kind would be good for veg?