For easy editing I use CyberLink PowerDirector that I bought a few years ago. It does a good job and does not slow my computer down all that much. For the last year or so I have switch over to Adobe Premiere as it has way more options and is better for color grading. Learning curve at the start is large but with Youtube Tutorials I caught on pretty fast and for what I don't understand Youtube again pulls me through.
I have tried DaVinci Resolve but just don't like it. That might be just me but it is another learning curve I do not wish to go through.
For my music I try to download mostly free stuff but most sucks. One place to get free music is Soundimage.org
Eric puts out some good tunes for drone videos and is active on some of the forums. I should invite him over here to start posting his stuff for us.
For uploading I used Youtube and last year I switched to Vimeo with their paid account but posting 4K was not included in the package I bought so I dropped them.
Hope this helps some.