Some basic but interesting topics in physics include:
Force and motion: This topic covers the basic laws of motion, such as Newton's laws, and how they apply to objects in motion.
Energy and work: This topic covers the concepts of energy, including kinetic and potential energy, and how energy is transferred through work.
Waves and sound: This topic covers the properties of waves, including transverse and longitudinal waves, and how they relate to sound.
Light and optics: This topic covers the properties of light, including reflection, refraction, and the behavior of light in lenses and mirrors.
Electric circuits: This topic covers the basic principles of electrical circuits, including Ohm's law and Kirchhoff's laws, and how they apply to the behavior of currents and voltages in circuits.
Thermal physics: This topic covers the basic concepts of temperature and heat, including the laws of thermodynamics, and how they apply to the behavior of gases and solids.
Special Relativity: This topic covers the basic concept of special relativity and how it affects the understanding of space and time.
Astrophysics: This topic covers the basic concepts of astronomy and astrophysics, including the properties of stars and galaxies, and the origin and evolution of the universe.
It's worth noting that these topics are just the tip of the iceberg, they are all interconnected and deep dives into any of these topics can lead to a deeper understanding of physics and the world around us.