If you are in Serbia, Croatia, Bosnia, Montenegro, or North Macedonia – the legal situation is the same as in the EU. Copyright laws apply, and ISPs sometimes block major download sites.
It sounds like you're asking for a review of "free downloading of songs from YouTube."
Here’s a balanced review covering legality, safety, quality, and practicality. "Besplatno skidanje pjesama sa YouTubea" (free downloading songs from YouTube) refers to using third-party websites, software, browser extensions, or apps to rip audio from YouTube videos as MP3 files.