There are a few different ways to merge two layers in Photoshop. You can use the “Layer” menu at the top of the window, you can use the keyboard shortcut, or you can right-click on one of the layers in the Layers panel and select “Merge Down.”
If you want to merge two layers and keep all of the information from both layers, you can use the “Layer” menu. Go to Layer > Merge Layers. This will create a new layer that combines both of the original layers.
If you only want to use part of one layer and part of another layer, you can use the keyboard shortcut. Hold down the Shift key and press Alt (Windows) / Option (Mac).
Then, click on the layer that you want to keep at the top of the stack. This will select both that layer and the one below it. Next, press Ctrl+E (Windows) / Command+E (Mac) to merge them.
You can also right-click on one of the layers in the Layers panel and select “Merge Down.” This will merge that layer with the one below it.
All of these methods will give you a new layer that combines information from both of the original layers. You can then adjust the opacity or blend mode to get the look that you want.