# Flexbox Properties: Most Common + Rare Properties

You need to master both Flexbox and CSS Grid in order to professionally build modern websites & web apps. If you haven't mastered both of them yet, I highly recommend going through my [CSS Course](https://bytegrad.com/courses/professional-css?utm_source=blog-post&utm_medium=blog-post&utm_campaign=blog-post).

Here's a list of the most common properties you will use in Flexbox (from my own experience) -- try opening in a new tab for bigger version:

![Flexbox_ most common properties.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1636673840799/Gw8eU87a4.png align="left")

Here's a list of more rare properties with a brief explanation:

1. `align-content` -- use this instead of `align-items` when you have multiple rows/columns (which you will have when flex-items have wrapped onto new lines).
    
2. `order` -- use this to change the order of flex-items. This is something you want to do sometimes when you make your project responsive. Some flex-item may then fall below another flex-item, because limited space on e.g. mobile forces everything into a 1-column layout, and you don't want that flex-item to sit below another one. This property works with a number, the lowest numbers come first in the order.
    

By the way, I think CSS is the 'bottleneck' to most websites & web apps. I believe it's the highest-ROI skill you can master.

Before I mastered CSS, I lost a ton of time & energy fiddling around with CSS.

I was learning about advanced JavaScript topics when I couldn't even implement basic layouts in CSS...

So I created a CSS course to help you avoid the same mistake. Check it out [here](https://bytegrad.com/courses/professional-css?utm_source=blog-post-2&utm_medium=blog-post-2&utm_campaign=blog-post-2) if you're interested.

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