If this is your first time, I would recommend JUnit.
It was the first, most popular. It is well documented, has excellent tool support, and is a metaphor that has been translated, at least initially, into all languages ββ(see xUnit Implementations). It should work great for most projects, and it's a good tool to learn. This will be a good base for you as a programmer.
There are other features of the βalternativesβ - why there are alternatives, but often this is a matter of style more than anything else. TestNG may have several different functions, but JUnit is also developing with functions such as annotations, alternative mappings, etc.
, JUnit Selenium, .