Eligible and Learning are statuses in your Adwords campaign, if you are seeing this two status this is what it means.
- Eligible: It means your campaign is Active and it can show ads.
- Learning: After you make a change to your bid strategy, it takes time for AdWords to gather the performance data it needs to optimize your bids. Then your campaign will have the status Learning, sometimes it can take like 7 days to gather data to optimize your campaign.
I hope this answers the above questions relating to the mean of Eligible (Learning) in Google ad campaign status.