Python is the easiest one to learn. It is the most used language for exploit writing as Python is the easiest programming language to write automation scripts because of pre-bult libraries with some powerful functionality.
Python has some important features that make it particularly useful for hacking, but probably most importantly, it has some pre-built libraries that provide some powerful functionality. Python ships with over 1,000 modules and many more are available in various other repositories. This isn’t to say that scripting languages like BASH, Perl, and Ruby can’t do the same things as Python, but building those capabilities are much easier using Python