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step in and help review a few PRs
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help the project triage/reproduce bugs
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if code in the PR looks complicated or is hard to understand, ask for an explanation
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express your gratitude to the maintainers
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make your company sponsor projects they depend on
https://mastodon.social/@bagder/112194895793007918
Daniel is the creator of cURL : https://daniel.haxx.se/blog/2021/03/30/howto-backdoor-curl/
If the project has a community forum or chat, be active and help answer questions. That takes a lot of pressure off the dev team. I did that for 4-5 years on the Handbrake project before family commitments ate up my free time.
I myself am a maintainer/main developer of a project and the people that help out in the group chat are a god sent. Takes a lot of pressure out of my day.