I think I figured out how to turn the corner to the next row:
And I know what I did – at the end of the row (at least my rows) there is always a big loop that can’t be tightened. Unless, you loop the yarn over the needle. I just assumed that anything that made that big loop go away was the right thing to do!

You might have been knitting the two ‘legs’ of the last stitch in the previous row, which would mean you were adding a stitch every row.
Looks like you might have conquered that little trap.
Don’t worry – there’ll be others. Knitting is full of fun little traps…
Be valiant; forge on!