‘WordPress: curl (60) SSL certificate problem’

Today before the training session, when a mentor tried adding my website’s feed in dgplug planet , they told me there was an error, and they asked me to use the curl command on the website, so I did. curl https://techtrials.tech/feed I had a valid SSL certificate from Lets Encrypt, and my website ran on all the major browsers. However, the curl command threw the following error. curl: (60) SSL certificate problem: unable to get local issuer certificate More details here: https://curl.