What problems see from the picture
It won’t charge and turn on my MacBook Air 2020
Because battery connection is corroded?
This looks pretty normal to me. What looks like liquid is leftover flux from the manufacturing process. It's not unusual to see on these larger blobs of solder. And those two large solder blobs look like that on most other MacBook Airs I have seen.
Does the machine turn on if you unplug the battery? If it does not, battery is likely not your issue. I would try unplugging the trackpad next. and see if that makes a difference.
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