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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/
I personally think you should move the fourth bullet (express your gratitude to the maintainers) to the first position in your list. But a great, simple list none-the-less.