I am BIG on saying "Documentation Counts". I can guarantee the open source project has something missing in the documentation. You can def start there at any point. Or even checking out the "good first issues" the project may have. The other thing is if the project is something you use and you think of a feature or see a bug...submit those issues! I won't say go whole hog on nothing but grammatical errors and misspelled words, but def count those small wins. Seeing something small get accepted or merged is a great bump to the "I did that!!" part of your brain.
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