Audacity

For individuals looking to record and/or only make quick, small edits or tweaks to audio, Audacity should be your go-to software. Tools are mostly self-explanatory and easy to use. Requires some computer literacy to initially set up, but otherwise is easy to use. Audacity, however, is not best suited for multi-track or advanced audio engineering projects.

Audacity is great when you just need something simple and easy to use for editing audio tracks. If you only have very basic needs (cutting off the end of a too-long track, inserting silence, raising or lowering the overall volume, fading in or out, combining tracks--even making simple loops) and don't need or want to pay for a program with greater functionality, Audacity is perfect as it is free and very simple to use.

We use Audacity as a podcast editing, prep, and export tool; it has enough filtering and audio-processing features to perform tasks like balancing tracks, removing background noise, and it lets us make fast edits across multiple synced audio tracks. A common scenario for us is chopping out a minute or two of irrelevant conversation from the three parallel tracks for each podcast participant — some of the simpler editing tools we evaluated required that edits be made track-by-track, all but ensuring the audio falls out of sync.

The more complex the editing, the more Audacity's clunky interface can frustrate — it's impossible to beat the price (free!) but it's also easy to feel lost when trying to accomplish something basic until you learn its idiosyncrasies.

It's a great tool to use that I've grown to love over the years. I don't use anything else to edit my audio at this time. It's an excellent app that I don't have any suggestions for improvement.

Audacity is great for pretty much anyone, it can be used for many tasks ranging from professional audio recording to recording just for fun.
It's more or less beginner-friendly, at the very beginning there might be some difficulty in getting to know where everything is but there isn't too much to see so getting used to the software won't be hard either.
I would recommend audacity to anyone who is starting out with audio editing and recording, but if you are doing this professionally the better choice would be to go for a paid software like Adobe Audition.