Welcome to this tutorial video series. In this video series we're trying to make some videos that are a little bit different than the normal mix of videos you see. In these tutorial videos we're trying to give you more background, more accessible information about house-specific issues. You should also note that these tutorial videos are not mandatory. So we don't require you to watch these. In fact, I would suggest you to start by watching normal lecture videos. Then you can go through the syllabus material that we supplied, and then try out a quiz. If you're still having trouble solving the quizzes, then you can go to these tutorial videos. In these, I'll try and explain in more detail how to solve specific problems that you'll encounter in quizzes. And we try to make these videos based on a demand we see in the forums. So if you don't find your answer to your question in any of these tutorial videos, then please do go to the forums because that's a really good resource. Ask your question there. Typically some of your fellow students will be there to help you. If not, we can help you, and if we see a high enough demand in the end, we'll probably make a tutorial video based on your question. So please use this when you like. So watch tutorial videos if you want. If not, please skip them. But other than that, I'll say see you in the next tutorial video.