A digital audio workstation(DAW) is an electronic device or application software used for recording, editing and producing audio files. (WIKIPEDIA).
There are several options of DAW to pick from depending on your needs and pocket.
Pro Tools (Excellent for film Sound and Music production)
Nuendo(Excellent for film Sound and Music production)
Adobe Audition (Great for film Sound and Music production)
Logic Pro (Great for film Sound and Music production)
Cubase (Good for film Sound and Music production)
Studio One (Good for Music production)
Audacity (Perfect for recording and Basic editing)
Fruity Loops (Good for Music production), etc.
All these DAWs allow you record and edit audio files. However, some of these DAWs are more robust and stable than others, hence the price!
Pro Tools is still the best, most robust and widely accepted industry standard for sound editing and music production, while all others are just good enough to do whatever it is you need to do.
It is very important for beginners to try their hands on a couple of DAWs in order to decide which will suit their needs. Moreover, you might not want to spend too much on DAW Subscriptions before you start making money from using them.
Adobe Audition is yet another amazing DAW. It’s major flaw is its instability and its lack of MIDI capacity. Midi is a technical standard that describes a communications protocol, digital interface, and electrical connectors that connect a wide variety of electronic musical instruments, computers, and related audio devices for playing, editing and recording music. (WIKIPEDIA).
In simpler terms, Midi allows you connect a keyboard to a DAW via USB or midi cable for the purpose of music production or sound design.
Adobe Audition possesses great sound editing capacities and is deemed the most cost effective means of sound editing compared to Pro tools!
You do not need MIDI for sound editing. Midi might be needed for some other functionalities in sound design.
Here are some best free DAWs for beginners:
Pro tools first: Record, Edit, Mix, Midi
Audacity: Record, Edit, Mix
Adobe Audition (30 Days Trial): Record, Edit, Mix
Studio One (30 Days Trial): Record, Edit, Mix, Midi
Please note that these free DAWs have critical limitations until you pay or subscribe for the full package. But before you cross over, the free package should offer just enough to learn recording, editing and mixing.