Is there a song you like but the key is too high for your voice? Or maybe too low? Or maybe some of the chords are a bit awkward for you?
Why not change the song to a different key - one you like better? It's called transposing. You can do it yourself, chord by chord, of course, but there's a quicker and easier way.
Here's a link to an excellent site called ChordChanger. It's run by Eric. He's a really good guy and it's a pleasure to support him. There are other transposing sites but this one is our favorite.