Open an image in Photoshop. Use any selection tool to select a part of the image you want to fill.

Choose Edit > Content-Aware Fill.

Photoshop launches the Content-Aware Fill workspace.

Within the Content-Aware Fill workspace, the document window displays the default sampling area as an overlay mask over the image. You can use tools provided in the Tools panel (at the left of the screen) to modify the sampling area and your initial selection of the fill area. In the Content-Aware Fill panel (at the right of the screen), you can specify sampling options, fill settings, and output settings to get the desired fill result in the image. As you make changes, the Preview panel displays a live full-resolution preview of the output.