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This depends on what level you are at and what style you are interested in .
Right now I am working on a simple version of freight train and refining Spike Driver Blues. Both finger picking songs.
If you are a beginner I would focus on songs with very simple strumming of basic open chords. While they may not sound like much, you are learning basic skills like strumming, timing, clean chord changes etc.
Bob Dylan’s knocking on heavens door would be one. I just learned that one myself.