When working with Flexbox, you have the ability to align individual flex items within a container and change their order visually on different screen sizes. This can be achieved using the align-self property and the order property.

The align-self property allows you to override the default alignment of an individual flex item. By applying align-self: flex-start, align-self: flex-end, or align-self: center, you can align the item to the start, end, or center of the container, respectively.

The order property, on the other hand, allows you to change the order in which flex items appear within the container. By assigning different order values (e.g., order: 1, order: 2, etc.) to the items, you can visually rearrange them according to your desired layout.

Let's take a look at an example. Consider a flex container with three flex items. By applying the following CSS:

.container {
  display: flex;
}

.item1 {
  order: 2;
}

.item2 {
  order: 3;
}

.item3 {
  order: 1;
}

The third item, initially positioned at the start, will now move to the end due to the order values assigned to each item.

Keep in mind that the align-self property and the order property only affect the individual items within the container and do not change the overall layout of the container itself.

By utilizing these properties effectively, you can have more control over the alignment and ordering of flex items, creating visually appealing and responsive layouts.