I also mostly contribute on a project that I use or have impact in my productivity as long as it's quick to patch.
For big projects, the goal is different. It's more like self-learning on how it works. A PR can take very long and might require constant merge conflict with the upstream. Also, you might forgot that PR because it takes very long to review caused by other PR/features need to be merged/implemented first before moving on. Asking the community manager or do extensive research first might be necessary before contributing.
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I also mostly contribute on a project that I use or have impact in my productivity as long as it's quick to patch.
For big projects, the goal is different. It's more like self-learning on how it works. A PR can take very long and might require constant merge conflict with the upstream. Also, you might forgot that PR because it takes very long to review caused by other PR/features need to be merged/implemented first before moving on. Asking the community manager or do extensive research first might be necessary before contributing.