In the following four lectures ("Optional: ...") we create the project required for this responsive section from scratch.

The required HTML & CSS concepts were already taugt in the previous modules of this course, therefore you have two options now:

a) Follow along the "Optional" lectures to revise the already learned concepts and create another website

b) Skip the "Optional" lectures and directly continue with the lectures about responsive design ("What is Responsive Design?")

The choice is up to you, we recommend to also dive into the optional lectures as practicing is the best you can do on your way to become a web developer :)