How to install certificates in centos 7

prompt -- no-check-certificate when using wget. Please tell me how to install the certificate

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Wget Certificate ca
Mar.31,2021 
yum install ca-certificates

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e40f6f-58e7e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e40f6f-58e7e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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