In a medium bowl, mash the avocados with a fork or a potato masher until they are mostly smooth but still chunky.
Add the mashed avocado with the red onion, tomato, cilantro, jalapeno pepper, garlic, lime juice, and salt to the bowl. Stir gently until everything is well combined.
Taste the guacamole and adjust the seasoning as needed with more lime juice or salt.
Serve the guacamole immediately with tortilla chips or your favorite dipping foods.
Notes
If you want smoother guacamole, combine the ingredients with a food processor or blender.