Welcome!
Not sure what you mean by “folk” but it may include some of what I like to play like Red River Valley, You Are My Sunshine, Swing Low Sweet Chariot, Jambalaya, Summertime, Over the Rainbow (what I call “Americana”) As well as “international folk” like Asa Branca, Amore Mio non Piangere, Tarantella, Vieni Sul Mar, Ach du Lieber, Beer Barrel. Etc.
What do you have in mind?