Step 1: Open any one image in your Photoshop
Step 2: Unlock the layer by clicking on lock symbol.
step 3: Then go to the rectangle tool show the left side bar on photoshop.
Step 4: There you find an option named custom shape tool.
Step 5: Click on Custom Shape tool.
Step 6: After that go to the top bar there you find this like below.
Step 7: Click on it.
Step 8: Now chose a shape.
Step 9: Draw the shape on the image that you open first by pressing Shift key on your keyboard.
Step 10: Now up down the layer.
Step 11: Now right click on top layer.
Step 12: Now you see a option create clipping mask. press on it.
Now its complete.