I struggled soooo much with the straight lines. I have better control with horizontal lines (moving my arm from left to right) but not so much with vertical ones, where my arm moves backwards not in a straight line but at an angle. Of course I can rotate the paper, but i am guessing that isgood to train my arm to the up and down movement (?). This class helped me also to get familiar with different brushes and watercolor sets. I noticed my watercolor pad wasnt good for washes, specially wet on wet techniques, since then I have bought a 300g pad.