I am using Nginx Proxy, and I need to check the information/validity of the cert. Where would I go to get this information?
Hello @victoria.sanchez, welcome to the Let's Encrypt community. 
Here are 3 online tools to assist and there are many many more out there.
- https://crt.sh/ (often slow to be up to date I find)
- SSL Checker
- SSL Server Test (Powered by Qualys SSL Labs)
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Usually, one would validate each certificate in the chain with the previous (signing) one.
If you could tell us more than the current two sentences, we might be able to help you better.
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It really depends on what you mean by your question. When I need more information from a certificate file that I have, I like to run openssl x509 -text -in certificate.pem
Since you got three different answers, it might not hurt to let us know the problem you are trying to solve. 
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That said, we might be dealing with Nginx Proxy Manager (not sure), so possibly all bets are off..
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