Another powerful tool of freeware, which one can use to fill in those fields of sound. It’s open source, has a multi-track editor and a recorder for Windows, Mac and Linux. You can create music, podcasts and sound effects. Anything you want really! Its UI used to be fairly old and confusing in the past, but now it has been modernized to the pretentious needs of users.
Official Page – https://audacityteam.org
If you’re starting out, or even when you’re deep in, with projects and ideas, just download Audacity and get those ideas rolling down the path to existence, otherwise they ain’t happening anytime soon.
What Audacity can do is nothing short of what professional software can offer. It is just way more technical and noob unfriendly. You can make your own plugins, use existing one, edit files and convert them to others.