What is grid based design?

It is literally a grid based design with columns and rows used to structure the layout of elements on your webpage.

Whats all the hype about responsive webpages?

We are living in a time where more people are accessing the web with mobile devices and tablets. Having a responsive site that changes and adapts to the users screen resolution is a must for any web developer.

Semantic structure?

Structuring the elements of your website in a way that the computer can easily recognise and process your code. For example "h1" is the most prominent header style so this should be used as your main headings at the top of your page and the smaller headings should follow down the page.

Any other points you found interesting and want to reflect on?

I really enjoyed this Udacity lesson and learnt a lot of skills. If I had known this stuff before it would have made designing and creating this site so much easier.