How Should I Set My Sidebar Size: PX or VW?

Media queries are key! You need them to ensure your sidebar fits well on all screen sizes. For widths, you could use pixels or percentage values; just remember that vw is great for mobile but might mess with your layout otherwise. Consistency is crucial, so choose a method and stick with it!

It honestly depends on the content you have. If your sidebar is mainly navigation links, extra space would benefit the main content area more. But if it includes lots of help text, a wider sidebar might be useful. Using `clamp()` or a combination of `min()`/`max()` will help prevent it from getting too wide.

Using rem for all sizing can simplify things. It allows for easy scaling across your site by just changing the root rem value. But keep in mind that you may not want your sidebar tied directly to font sizes.

Think about these factors: minimum width should be in ems to fit content comfortably; normal width could be percentages to keep it proportional; and maximum width again in ems to suit its content without stretching too far. In really narrow viewports like phones, consider skipping the sidebar layout altogether!

People with 4k monitors definitely have scaling set up. If they don't, they likely prefer smaller sizes, so a smaller sidebar shouldn't be an issue for them.

Consider using the `clamp()` function for your sidebar size. It lets you set a minimum and maximum width while adjusting the ideal size with viewport units, making it more flexible across different screen sizes.