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Part of the difficulty of starting out are finding songs that you can do that also just challenge you enough. I typically pull from this list of songs ranked by Reddit mentions based on difficulty when I want to try something new: https://github.com/shawnaxsom/recommended-guitar-songs/blob/master/README.md
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.