In CSS Grid Layout, the placement and alignment of grid items within the grid can be easily manipulated using various properties. Let's explore a few of these properties:

1. grid-column and grid-row: These properties allow you to specify the start and end positions of an item within the grid, determining its size and position.

2. justify-content and align-content: These properties control the alignment of grid items along the horizontal and vertical axes, respectively.

3. justify-items: This property defines the alignment of items within their respective grid cells.

By combining these properties, you can create different layouts and visually organize your content on the grid.

.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 10px;
}

.grid-item {
  grid-column: 1 / 3;
  justify-self: center;
  align-self: start;
}