It's great that you're making tutorials to help others. I wish I had the time to do that. Good job.
I just have a small suggestion. It's your choice to accept it or not.
Why do you have a question mark (?) in your title? Are you asking for help? Obviously not. One of the most basic skills to learn when marketing/advertising something is how to attract your target audience. You want people to click on your link if they DON'T know how to make responsive layouts. That title only pushes them away. You should get rid of the (?) and add (tutorial) in front of it.
Other than that, your video is decent and informative.