It’s a good idea to look for the song in piano style. So you can refresh your piano knowledge.
But if you search not only sheet music when you look for a song you can also givgive in the title and chords“chords”, tabs“tabs” or look under “image”. Then you will find the song with the chords.
Under “tabs” you will learn to read the tab notation and you can see which strings you have to play in which bend.
With these 3 systems you can improve your understanding for chords and guitar playing. And when questions will arise you’ll look up the basics of theory.