Imagine having to design for like 30 screens, that’s a lot of work and a waste of time. Responsive design helps make designs for all screen sizes. I understand now why the professor said to start at the mobile level first and work yourself up. Make sure you have the important things like font, color, padding, images down. Tip: Don’t give elements specific heights and widths because then you will have problems and have to add a lot of code. Then start adding media queries for responsive design.