Install Layer Styles
Layer Styles are a beloved feature of many Photoshop users, and living without them can be a difficult adjustment. Layer Styles are called Layer Effects in GIMP and include: Drop Shadow, Inner Glow, Outer Glow, Gradient Overlay, Stroke, Bevel and Emboss, etc. These can be used to quickly apply effects to your layer(s) without having to jump through hoops.
Download the Layer Effects GIMP plug-in from Gimp.org. There are two versions: Script-Fu and Python. The Python version allows for live previews of the effects; the Script-Fu version does not. No matter which version you choose, save the plug-in in GIMP’s Plug-in folder and restart the program.
If you download the Python version, Layer Effects will be added under Image > Layer > Layer Effects. The Script-Fu version will be listed under Script-Fu > Layer Effects.