Here are some basic types of gears and how they are different from each other.
Different types of gears and its uses
What's the Difference Between Spur, Helical, Bevel, and Worm Gears? – Precision Automation
Best Practices for SolidWorks Mates
What's the Difference Between Spur, Helical, Bevel, and Worm Gears? – Precision Automation
What's the Difference Between Spur, Helical, Bevel, and Worm Gears? – Precision Automation
Advantages of Worm Gears - Gear Motions, Precision Gear Manufacturer
Types of Gears, KHK
Spur Gears - an overview
Week 10 Helical, Bevel and Worm Gears I, PDF, Gear
Planetary gears — A review of basic design criteria and new options for sizing
Overview of gear types - tec-science
Differences Between Worm and Helical Gear
An In-Depth Look at Common Gear Types: Explaining the Key Differences Between Spur, Helical, Bevel, and Worm Gears