Step 1: Click the "Render Properties"
Step 2: Find the “Film” tab
Step 3: Open the tab and click the “Transparent” button
RENDERİNG
Press F12 button or click the render tab and click the "Render Image"
When your rendering is finished, you will see an image similar to the one in the photo.
SAVİNG RENDER
Step 1:Open the Image tab
Step 2:Click the “Save As…” or use the shortcut “Shift+Alt+S” to Save As

Step 3: Give a name for your image and click the "Save As Image"
You are done now.The result should be like in the picture