There are online courses to learn about almost every subject, is there somewhere that aggregates resources on how to master software? I'm thinking about software like Excel and Premiere Pro.
Pick a project. Work through that project using free tutorials. Only pay if you can't get info for free. You can always get info for free.
Udemy has online courses for many software applications, including Excel and Premiere Pro. I don't know how good they are. I am sure there are other sources, as well.