From youtube try to download and convert for free, any advice

I know that you can share music from you tube and then make a copy of the music file, I heard from someone that you can copy it to a converter program the copy link of you tube and that he then make an mp3 and that you can download it and then put it on your pc, but the programs that I use contain a lot of pop ups, which results in a lot of junk on your hard disk, because I make a wave from an mp3 file and process it in renoise, does anyone know how to do this safely via a program from the internet because there are many pop ups programs


Command-line program

Delete ube from the web address and you find a website with the file to dl (te better quality need to be paid but there is enough)