Today I finished lessons 3, 4, 5, 6, and 7 of Advanced HTML and CSS. Lesson 3 taught me how to embed websites, which means to create a smaller window on my page that shows a preview of another website. Lesson 4 taught me how to use the tag <div> to style my websites. Lesson 5 taught me how to use the tag <span> which is the exact same as the <div> tag, except it doesn’t create any extra line breaks. Lesson 6 taught me how to combine CSS selectors. For example: I could put h1.header instead of .header to only affect <h1> tags with the class header instead of all h1 tags or all tags with the class header. Lesson 7 taught me about the DRY method, which helps keep your code (especially your CSS code) compact by aloowing you to merge multiple rules together with commas.