Please explain more about what type of acoustic analysis you wish to do. For example, are you working with industrial noise acoustics, architectural acoustics, human voice acoustics, animal sounds, acoustics of musical instruments, natural soundscape acoustics, etc. The types of analyses needed (hence the appropriate software recommendations) can be quite different depending on the specific domain of acoustics one is studying. You are more likely to get useful advice here if you can provide more background for your question.
Hello again, Farah. I see from your profile that your interest is primarily in phonetics. I am not a phonetics expert, but I know that Praat (https://www.fon.hum.uva.nl/praat/) is a very widely used package in this field, specifically designed for phonetic analysis, with a large set of features. It is free and open source and runs on most operating systems. Although it can be challenging to learn, there is an enormous amount of documentation online provided by the many users around the world.