What are some effective DIY insulation methods for improving energy efficiency in a home?

Some effective DIY insulation methods for improving energy efficiency in a home include adding weather stripping around doors and Windows, sealing gaps and cracks with caulk or foam insulation, installing thermal curtains or blinds, and using draft stoppers at the bottom of doors. Additionally, adding insulation to attics, walls, and floors can also help reduce energy loss and improve overall energy efficiency in a home.