CSS Columns are awesome! You can easily create multi-column, repsonsive layouts WITHOUT media queries. I don't see them used a lot these days, and there is no excuse considering how good browser support is (even IE fully supports it, I mean, what else can we ask for!).
The two main properties are column-count and column-width, but I also take a look at column-rule and column-gap, as well as the columns shorthand.
CodePen from this video: https://codepen.io/kevinpowell/pen/BYXdJx
It's really easy to create columns with CSS, and can make creating layouts a lot easier. If you like this video, and would like a deeper dive into CSS columns, with some use cases and a few other properties though, let me know and I'll make a little deep dive series into these as well.
In the meantime if you'd like to learn more, start here: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Columns/Using_multi-column_layouts
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